Z31/DigitalDashRepair php - Revision history

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	Alternatively, you can source a replacement digital cluster or swap to an analog cluster		Alternatively, you can source a replacement digital cluster or swap to an analog cluster
	(note: this requires significant wiring modifications). [~~https://dev.z31library.com/xenonzcar_archive/z31~~/digitaltoanalog.php Instructions can be found here]		(note: this requires significant wiring modifications). [[Z31/digitaltoanalog php\|Instructions can be found here]]

	=== Digital Speedometer Always Reads "0" ===		=== Digital Speedometer Always Reads "0" ===
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	=== Sources Used ===		=== Sources Used ===

	* [~~https://dev.z31library.com/xenonzcar_archive/z31~~/z31fsm.php 1984-1989 Nissan 300ZX USDM Factory Service Manual]		* [[Z31/z31fsm php\|1984-1989 Nissan 300ZX USDM Factory Service Manual]]
	* [~~https://dev.z31library.com/xenonzcar_archive/z31~~/z31fsm.php EURO Market Nissan 300ZX Factory Service Manual]		* [[Z31/z31fsm php\|EURO Market Nissan 300ZX Factory Service Manual]]
	* Based on Write-up by: Frank Zemaitis, Added to By XenonZcar		* Based on Write-up by: Frank Zemaitis, Added to By XenonZcar

	[[Category:Imported from Xenonzcar]]		[[Category:Imported from Xenonzcar]]

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	One such product was from '''Cogworx'''. Their converter allowed a 10" 240-33 ohm fuel level		One such product was from '''Cogworx'''. Their converter allowed a 10" 240-33 ohm fuel level
	sender (commonly used in marine applications) to interface with the digital dash. These were once available		sender (commonly used in marine applications) to interface with the digital dash. These were once available
	through [		through [https://www.thezgarage.net/store/p50/Digi-Dash_Fuel_Level_Sender_Converter.html The Z Garage], but are currently '''sold out'''.
	~~The Z Garage~~
	](https://www.thezgarage.net/store/p50/Digi-Dash_Fuel_Level_Sender_Converter.html), but are currently '''sold out'''.

	=== Sources Used ===		=== Sources Used ===

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	== Z31 Digital Dashboard Issues and Repairs ==		== Z31 Digital Dashboard Issues and Repairs ==

	![~~Z31 Digital Dash](~~https://dev.z31library.com/xenonzcar_archive/z31/images/Digital ~~Dash~~/earlydash.jpg)		![https://dev.z31library.com/xenonzcar_archive/z31/images/Digital%20Dash/earlydash.jpg Z31 Digital Dash]

	Early Z31 Digital Dash Cluster		Early Z31 Digital Dash Cluster
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	-		-
	The		The
	[~~power supply unit](~~https://dev.z31library.com/xenonzcar_archive/z31/images/Digital ~~Dash~~/pudash.jpg)is located above your right knee behind the trim panel that contains the hood release and steering wheel tilt lever. - Remove the trim panel, then locate the PSU box (approx. 5"x5"x1"). It's held in place with one 10mm bolt and one 10mm nut. There are also two welded brackets secured with screws and two wire harnesses connected to the unit.		[https://dev.z31library.com/xenonzcar_archive/z31/images/Digital%20Dash/pudash.jpg power supply unit]is located above your right knee behind the trim panel that contains the hood release and steering wheel tilt lever. - Remove the trim panel, then locate the PSU box (approx. 5"x5"x1"). It's held in place with one 10mm bolt and one 10mm nut. There are also two welded brackets secured with screws and two wire harnesses connected to the unit.

	==== Common Fixes: ====		==== Common Fixes: ====
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	* Clean any corrosion from the contacts while you have the unit removed.		* Clean any corrosion from the contacts while you have the unit removed.

	![~~Corroded Power Supply](~~https://dev.z31library.com/xenonzcar_archive/z31/images/Digital ~~Dash~~/pucorode.jpg)		![https://dev.z31library.com/xenonzcar_archive/z31/images/Digital%20Dash/pucorode.jpg Corroded Power Supply]

	https://dev.z31library.com/xenonzcar_archive/2025siteimages/psu-solder.jpg		https://dev.z31library.com/xenonzcar_archive/2025siteimages/psu-solder.jpg
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	damage the internals.		damage the internals.

	![~~Z31 Digital Speed Sensor](~~https://dev.z31library.com/xenonzcar_archive/z31/images/Digital ~~Dash~~/spdsensrt.jpg)		![https://dev.z31library.com/xenonzcar_archive/z31/images/Digital%20Dash/spdsensrt.jpg Z31 Digital Speed Sensor]

	==== Step 1: Test the Speedometer Cable ====		==== Step 1: Test the Speedometer Cable ====

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	=== Sources Used ===		=== Sources Used ===

	[https://dev.z31library.com/xenonzcar_archive/z31/z31fsm.php 1984-1989 Nissan 300ZX USDM Factory Service Manual][https://dev.z31library.com/xenonzcar_archive/z31/z31fsm.php EURO Market Nissan 300ZX Factory Service Manual]- Based on Write-up by: Frank Zemaitis, Added to By XenonZcar		* [https://dev.z31library.com/xenonzcar_archive/z31/z31fsm.php 1984-1989 Nissan 300ZX USDM Factory Service Manual]
			* [https://dev.z31library.com/xenonzcar_archive/z31/z31fsm.php EURO Market Nissan 300ZX Factory Service Manual]
			* Based on Write-up by: Frank Zemaitis, Added to By XenonZcar

	[[Category:Imported from Xenonzcar]]		[[Category:Imported from Xenonzcar]]

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	{{ImportedFrom\|site=Xenonzcar\|title=Z31 Digital Dashboard Issues and Repairs\|url=~~http~~://~~www~~.~~xenonzcar~~.com/z31/DigitalDashRepair.php.html\|archive=https://dev.z31library.com/xenonzcar_archive/z31/DigitalDashRepair.php.html\|fetched=2026-05-15}}		{{ImportedFrom\|site=Xenonzcar\|title=Z31 Digital Dashboard Issues and Repairs\|url=https://dev.z31library.com/xenonzcar_archive/z31/DigitalDashRepair.php.html\|archive=https://dev.z31library.com/xenonzcar_archive/z31/DigitalDashRepair.php.html\|fetched=2026-05-15}}

	== Z31 Digital Dashboard Issues and Repairs ==		== Z31 Digital Dashboard Issues and Repairs ==

	![Z31 Digital Dash](~~http~~://~~www~~.~~xenonzcar~~.com/z31/images/Digital Dash/earlydash.jpg)		![Z31 Digital Dash](https://dev.z31library.com/xenonzcar_archive/z31/images/Digital Dash/earlydash.jpg)

	Early Z31 Digital Dash Cluster		Early Z31 Digital Dash Cluster
Line 43:		Line 43:
	-		-
	The		The
	[power supply unit](~~http~~://~~www~~.~~xenonzcar~~.com/z31/images/Digital Dash/pudash.jpg)is located above your right knee behind the trim panel that contains the hood release and steering wheel tilt lever. - Remove the trim panel, then locate the PSU box (approx. 5"x5"x1"). It's held in place with one 10mm bolt and one 10mm nut. There are also two welded brackets secured with screws and two wire harnesses connected to the unit.		[power supply unit](https://dev.z31library.com/xenonzcar_archive/z31/images/Digital Dash/pudash.jpg)is located above your right knee behind the trim panel that contains the hood release and steering wheel tilt lever. - Remove the trim panel, then locate the PSU box (approx. 5"x5"x1"). It's held in place with one 10mm bolt and one 10mm nut. There are also two welded brackets secured with screws and two wire harnesses connected to the unit.

	==== Common Fixes: ====		==== Common Fixes: ====
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	* Clean any corrosion from the contacts while you have the unit removed.		* Clean any corrosion from the contacts while you have the unit removed.

	![Corroded Power Supply](~~http~~://~~www~~.~~xenonzcar~~.com/z31/images/Digital Dash/pucorode.jpg)		![Corroded Power Supply](https://dev.z31library.com/xenonzcar_archive/z31/images/Digital Dash/pucorode.jpg)

	~~[http~~://~~xenonzcar~~.com/2025siteimages/psu-solder.jpg ~~image: Cracked Solder Pins]~~		https://dev.z31library.com/xenonzcar_archive/2025siteimages/psu-solder.jpg

	'''Need Your Power Supply Repaired?'''		'''Need Your Power Supply Repaired?'''
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	Alternatively, you can source a replacement digital cluster or swap to an analog cluster		Alternatively, you can source a replacement digital cluster or swap to an analog cluster
	(note: this requires significant wiring modifications). [https://~~www~~.~~xenonzcar~~.com/z31/digitaltoanalog.php Instructions can be found here]		(note: this requires significant wiring modifications). [https://dev.z31library.com/xenonzcar_archive/z31/digitaltoanalog.php Instructions can be found here]

	=== Digital Speedometer Always Reads "0" ===		=== Digital Speedometer Always Reads "0" ===
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	damage the internals.		damage the internals.

	![Z31 Digital Speed Sensor](~~http~~://~~www~~.~~xenonzcar~~.com/z31/images/Digital Dash/spdsensrt.jpg)		![Z31 Digital Speed Sensor](https://dev.z31library.com/xenonzcar_archive/z31/images/Digital Dash/spdsensrt.jpg)

	==== Step 1: Test the Speedometer Cable ====		==== Step 1: Test the Speedometer Cable ====
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	=== 1984 Fuel and Coolant/Oil Pressure/Voltmeter Section Blank ===		=== 1984 Fuel and Coolant/Oil Pressure/Voltmeter Section Blank ===

	~~[http~~://~~xenonzcar~~.com/2025siteimages/84fuel-coolant-blank.jpg ~~image: 1984 Digital Cluster Fuel/Coolant Failure]~~		https://dev.z31library.com/xenonzcar_archive/2025siteimages/84fuel-coolant-blank.jpg

	(Image: XenonZcar Garage)		(Image: XenonZcar Garage)
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	components, leading to permanent damage if left untreated.		components, leading to permanent damage if left untreated.

	~~[http~~://~~xenonzcar~~.com/2025siteimages/84mainboarddamage.jpg ~~image: 1984 Digital Cluster Capacitor Damage]~~		https://dev.z31library.com/xenonzcar_archive/2025siteimages/84mainboarddamage.jpg

	(Image: XenonZcar Garage)		(Image: XenonZcar Garage)
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	replacement of the board.		replacement of the board.

	~~[http~~://~~xenonzcar~~.com/2025siteimages/transistordamage.jpg ~~image: Transistor Damage from Capacitor Failure]~~		https://dev.z31library.com/xenonzcar_archive/2025siteimages/transistordamage.jpg

	(Image: XenonZcar Garage)		(Image: XenonZcar Garage)
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	* With the steering wheel removed, you can now carefully pull the digital cluster out of the dashboard. I pull the bottom out first and then slide it towrds me being careful not to scratch the cluster lense.		* With the steering wheel removed, you can now carefully pull the digital cluster out of the dashboard. I pull the bottom out first and then slide it towrds me being careful not to scratch the cluster lense.

	~~[http~~://~~www~~.~~xenonzcar~~.com/z31/images/Digidashcolorchangecluster/DSC05090sm.png ~~image: Cluster Removal]~~		https://dev.z31library.com/xenonzcar_archive/z31/images/Digidashcolorchangecluster/DSC05090sm.png

	=== Fuel Gauge Reads Inaccurately ===		=== Fuel Gauge Reads Inaccurately ===
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	fingers can even '''break off completely'''.		fingers can even '''break off completely'''.

	~~[http~~://~~xenonzcar~~.com/2025siteimages/sendingunit.jpg ~~image: Z31 Fuel Sending Unit]~~		https://dev.z31library.com/xenonzcar_archive/2025siteimages/sendingunit.jpg

	(Image: dafunkmonster of z31performance)		(Image: dafunkmonster of z31performance)
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	=== Sources Used ===		=== Sources Used ===

	[~~http~~://~~www~~.~~xenonzcar~~.com/z31/z31fsm.php 1984-1989 Nissan 300ZX USDM Factory Service Manual][~~http~~://~~www~~.~~xenonzcar~~.com/z31/z31fsm.php EURO Market Nissan 300ZX Factory Service Manual]- Based on Write-up by: Frank Zemaitis, Added to By XenonZcar		[https://dev.z31library.com/xenonzcar_archive/z31/z31fsm.php 1984-1989 Nissan 300ZX USDM Factory Service Manual][https://dev.z31library.com/xenonzcar_archive/z31/z31fsm.php EURO Market Nissan 300ZX Factory Service Manual]- Based on Write-up by: Frank Zemaitis, Added to By XenonZcar

	[[Category:Imported from Xenonzcar]]		[[Category:Imported from Xenonzcar]]

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{{ImportedFrom|site=Xenonzcar|title=Z31 Digital Dashboard Issues and Repairs|url=http://www.xenonzcar.com/z31/DigitalDashRepair.php.html|archive=https://dev.z31library.com/xenonzcar_archive/z31/DigitalDashRepair.php.html|fetched=2026-05-15}}

== Z31 Digital Dashboard Issues and Repairs ==

![Z31 Digital Dash](http://www.xenonzcar.com/z31/images/Digital Dash/earlydash.jpg)

Early Z31 Digital Dash Cluster

The digital dash was part of an optional package that cost '''$1200''' when new.
This package also included an upgraded stereo and digital climate controls.
These clusters are known for a fairly common habit of failing over time — either the display
goes completely dark, or certain elements start disappearing.

==== Common Issues & Fixes ====

'''Complete power failure:'''Often caused by bad capacitors or a failed power supply board.'''Missing segments:'''Usually due to cold solder joints, bad capacitors, or other failed internal cluster electronics.'''Flickering display:'''Can be traced to unstable voltage regulation inside the cluster.

=== Running Digital Dash Self-Diagnostics ===

The Z31 digital dash includes a built-in self-test mode to check for dead segments and other display issues. To run the self-diagnostics, follow these steps:

* Turn the ignition
'''OFF'''. - Press and hold
'''both'''trip odometer buttons. - While holding the buttons, turn the ignition to the
'''ON'''position (do not start the car). - Release the buttons once the diagnostics start.
* Watch the display carefully and check for any
'''dead or missing segments'''.

Below are some Videos of each of the different Cluster types offered in the US Market cars. Canadian cars are very similar but the mesurements are in Metric. JDM Versions and AU Look the same as the Canadian model, But the wiring is completely different and I suspect any of the RHD cars are the same.

=== USDM 1984 Model Cluster Self Test ===

=== USDM 1985-1986 Model Cluster Self Test ===

=== USDM 1987-89 Model Cluster Self Test ===

=== Digital Dash Display Not Powering On ===

The most common cause of a Z31 digital dash failure is a faulty power supply unit (PSU) due to bad solder joints or poor contact. Below is the procedure to diagnose and repair this issue:

==== Steps to Remove and Inspect the Power Supply: ====

-
The
[power supply unit](http://www.xenonzcar.com/z31/images/Digital Dash/pudash.jpg)is located above your right knee behind the trim panel that contains the hood release and steering wheel tilt lever. - Remove the trim panel, then locate the PSU box (approx. 5"x5"x1"). It's held in place with one 10mm bolt and one 10mm nut. There are also two welded brackets secured with screws and two wire harnesses connected to the unit.

==== Common Fixes: ====

* Inspect the circuit board for
'''cracked solder joints'''. A Nissan TSB recommended replacement (~$400), but re-soldering often fixes it. - Check the connector pins; if they are loose, gently twist them with pliers to ensure better contact.
* For a permanent fix, you can solder the wires directly to the pins or wedge something between the connectors and box to keep a tight fit.
* Clean any corrosion from the contacts while you have the unit removed.

![Corroded Power Supply](http://www.xenonzcar.com/z31/images/Digital Dash/pucorode.jpg)

[http://xenonzcar.com/2025siteimages/psu-solder.jpg image: Cracked Solder Pins]

'''Need Your Power Supply Repaired?'''

This is a service we provide at XenonZcar. Pricing is about $100 plus shipping.
[
Contact Sales@xenonzcar.com
](mailto:sales@xenonzcar.com?subject=Digital Power Supply Repair (XenonZcar)) to have your Power Supply Unit professionally tested and repaired.

Alternatively, you can source a replacement digital cluster or swap to an analog cluster
(note: this requires significant wiring modifications). [https://www.xenonzcar.com/z31/digitaltoanalog.php Instructions can be found here]

=== Digital Speedometer Always Reads "0" ===

If your digital dash shows '''“0”''' at all times, the issue is usually a failed
'''speed sensor''' or a broken '''speedometer cable'''.
The speed sensor is sealed with epoxy, but over time the epoxy cracks, allowing water or salt to
damage the internals.

![Z31 Digital Speed Sensor](http://www.xenonzcar.com/z31/images/Digital Dash/spdsensrt.jpg)

==== Step 1: Test the Speedometer Cable ====

* Locate the speed sensor on the fender well near the battery. It has the speedometer cable and four wires (red, green, black, yellow).
* Unscrew the locking ring and remove the cable from the speed sensor. Watch for the black plastic alignment ring—do not lose it.
* Prop the cable so you can see the square end. Put the car in 5th gear and roll it forward/backward 3–4 feet.
* If the cable rotates about half a turn, the cable is good. If it doesn't move, the cable is broken.

==== Step 2: Bench Test the Speed Sensor ====

You’ll need: insulated alligator clips, a multimeter (analog preferred), and a 5–6V DC source.
'''Never apply 12V directly!''' If using the car battery, put a 750Ω resistor in series.

'''Black:'''Ground'''Red:'''+12VDC'''Yellow:'''Signal

Connect power to the black (ground) and red (+DC) wires. Connect the multimeter to black and yellow, set to 10K–100KΩ. Slowly turn the sensor shaft:

* If working, the analog needle will swing or digital resistance will vary from ~200Ω to infinity.
* If you see no movement, the sensor is bad and must be replaced.

==== If All this Fails... ====

If these steps fail to correct your issue and the sensor and cable both test good, Then the issue is internal to the cluster. Usually the other gauges will still be lit up but the readings will not be correct at all. The Voltmeter will usually read 16 (Max) and the other gauges will read near 0.

A Lot of times this can be repaired here at XenonZcar as the issue is caused by one of the Ceramic IC boards internal to the Cluster. The solder cracks off and the ceramic surface and the only fix is to replace it with a updated version as solder will not stick back to the ceramic.

=== 1984 Fuel and Coolant/Oil Pressure/Voltmeter Section Blank ===

[http://xenonzcar.com/2025siteimages/84fuel-coolant-blank.jpg image: 1984 Digital Cluster Fuel/Coolant Failure]

(Image: XenonZcar Garage)

On the '''1984 Digital Clusters''', a common failure is the '''Fuel Gauge''' section dimming over time and eventually going completely dark. This can also occur with the
'''Coolant/Oil Pressure/Voltmeter''' section either individually or together with the fuel section.

The root cause is '''failed electrolytic capacitors''' on the cluster’s main board. When these capacitors fail, they leak electrolyte that corrodes the copper traces and surrounding
components, leading to permanent damage if left untreated.

[http://xenonzcar.com/2025siteimages/84mainboarddamage.jpg image: 1984 Digital Cluster Capacitor Damage]

(Image: XenonZcar Garage)

In severe cases, the electrolyte seeps under '''transistors, Zener diodes,''' and even '''brightness control potentiometers'''. This can require extensive repair or complete
replacement of the board.

[http://xenonzcar.com/2025siteimages/transistordamage.jpg image: Transistor Damage from Capacitor Failure]

(Image: XenonZcar Garage)

If caught early, some damage can be cleaned and the failed components replaced. For minor board trace damage,
'''bridging the broken traces''' can restore functionality. However, if corrosion spreads too far, the
cluster may suffer '''complete failure'''.

'''Need Your Cluster Repaired?'''

This is a service we provide at XenonZcar. Pricing depends on the extent of damage.
[
Contact Sales@xenonzcar.com
](mailto:sales@xenonzcar.com?subject=1984 Digital Cluster Repair Fuel/Coolant Blank (XenonZcar)) to have your cluster professionally tested and repaired.

=== Cluster Removal ===

First,[remove the combo switches](Switchpodbulbs.php)on each side of the gauge cluster. While you are under the dashboard, it's recommended to also remove the two 10mm nuts holding the power supply unit to the dashboard and unplug the two connectors.

* Remove the 4 screws holding the digital cluster bezel in place, then carefully pull out the bezel.
* Remove the two screws (one on each side) securing the cluster into the dashboard.
* Disconnect the three wiring harness plugs located across the top of the cluster.
-
For better access, remove the steering wheel:
* Remove the column covers by taking out the 4 Phillips screws. Unclip the covers from the column.
* Disconnect the key light and steering wheel control harness if equipped.
* Pull the horn pad off (start from the top). This will reveal the 19mm nut securing the wheel to the column.
* Loosen the nut but do not remove it completely. Wiggle the wheel side-to-side or use a steering wheel puller with the 8mm x 1.25 threaded holes.
* Once loose, remove the nut and pull the steering wheel off completely.

* With the steering wheel removed, you can now carefully pull the digital cluster out of the dashboard. I pull the bottom out first and then slide it towrds me being careful not to scratch the cluster lense.

[http://www.xenonzcar.com/z31/images/Digidashcolorchangecluster/DSC05090sm.png image: Cluster Removal]

=== Fuel Gauge Reads Inaccurately ===

One of the most frequent problems with the '''Z31 digital clusters''' is the
'''fuel gauge reading incorrectly'''. Often, the gauge will read fine when the tank is full, but
as fuel is used, the reading will suddenly drop to '''zero'''.

The primary cause is the '''design of the fuel sending unit'''. It uses a carbon
trace to measure resistance based on the float’s position. Over years of use, the float fingers wear down the
carbon, creating '''dead spots''', or the fingers bend and lose contact. In some cases, the float
fingers can even '''break off completely'''.

[http://xenonzcar.com/2025siteimages/sendingunit.jpg image: Z31 Fuel Sending Unit]

(Image: dafunkmonster of z31performance)

The sending unit is accessible from inside the hatch under the rear carpet and foam pad. A circular cover hides
the wiring and access to both the '''sending unit''' and '''fuel pump'''.

'''⚠️ Important:''' Original '''digital dash fuel sending units''' are
'''no longer available'''. Analog sending units use a different resistance scale, making them
incompatible with digital clusters.

Some enthusiasts have attempted to design adapters to use the analog or aftermarket senders, but most
solutions have not achieved '''100% accurate readings'''.

One such product was from '''Cogworx'''. Their converter allowed a 10" 240-33 ohm fuel level
sender (commonly used in marine applications) to interface with the digital dash. These were once available
through [
The Z Garage
](https://www.thezgarage.net/store/p50/Digi-Dash_Fuel_Level_Sender_Converter.html), but are currently '''sold out'''.

=== Sources Used ===

[http://www.xenonzcar.com/z31/z31fsm.php 1984-1989 Nissan 300ZX USDM Factory Service Manual][http://www.xenonzcar.com/z31/z31fsm.php EURO Market Nissan 300ZX Factory Service Manual]- Based on Write-up by: Frank Zemaitis, Added to By XenonZcar

[[Category:Imported from Xenonzcar]]