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Author Topic: Gas Tacho / Revcounter Conversion to Diesel W terminal  (Read 126815 times)

Reply #135December 18, 2014, 02:43:52 am

TimpanogosSlim

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #135 on: December 18, 2014, 02:43:52 am »
I am pleased to report that, having replaced the original voltage stabilizer in my 1983 jetta gasser cluster with an $0.75 Fairchild LM7810, my tach works excellently! No wiring mods at all in my 1984 jetta. I modified the tach board and nothing else.

I'm sure i still need to tweak it, which will happen after i fasten a piezo pickup to my #1 injector line and hook up a silly scope.

PM me if you need to replace your voltage stabilizer. The $28 charged by mk1autohaus is highway robbery. $5 CONUS shipped. You'll need a stack of 7 or 8 #4 brass washers and a #4 1/2" wood screw because the LM7810 mounts up-side-down vs. how the original part was mounted. I have exactly 3 extras. heck, I'll even throw in a brass #4 1/2" screw .

Reply #136January 01, 2015, 09:42:06 am

Kraftwerk

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #136 on: January 01, 2015, 09:42:06 am »
Care to explain?

You modified the board as per original instructions AND replaced voltage stabilizer, OR just replaced voltage stabilizer and that made it work?

Sorry and thanks.
D24TIC power!

Reply #137January 17, 2015, 12:00:30 pm

Kraftwerk

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #137 on: January 17, 2015, 12:00:30 pm »
How do I take this apart without breaking anything?

Pic 1
Pic 2
Pic 3
D24TIC power!

Reply #138January 31, 2015, 08:24:44 am

Kraftwerk

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #138 on: January 31, 2015, 08:24:44 am »
Huh?
D24TIC power!

Reply #139February 05, 2015, 10:11:26 am

libbydiesel

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #139 on: February 05, 2015, 10:11:26 am »
If you are stuck there, I question whether or not you should be attempting the conversion. 

De-solder the two wires noting their color/location.  Lift off the circuit board.
Use, abuse or ignorance of any information is at your own risk, confirmation or refutation is your own responsibility, no further 'proof' will be given, take it or leave it, YMMV,terms subject to change without notice, avoid contact with eyes or skin, contents known to cause cancer in California

Reply #140March 13, 2015, 12:46:13 pm

trellsbells2

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #140 on: March 13, 2015, 12:46:13 pm »
Has anybody modified this board to make it work? the circuit is different, but not too much different than the other boards mentioned in this post. Still cant figure out how to covert it though. I have a schematic drawn out if anyone wants to see that but it isn't the prettiest drawing :)

Reply #141September 06, 2015, 06:07:31 pm

libbydiesel

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #141 on: September 06, 2015, 06:07:31 pm »
I just got a mk1 tach swapped over in my '79 rabbit.  Along with replacing the appropriate tachometer components I also had to add the W-terminal to the alt also as the alt didn't have one.  It works great. 
Use, abuse or ignorance of any information is at your own risk, confirmation or refutation is your own responsibility, no further 'proof' will be given, take it or leave it, YMMV,terms subject to change without notice, avoid contact with eyes or skin, contents known to cause cancer in California

Reply #142September 01, 2017, 08:55:11 pm

hugoalves6

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #142 on: September 01, 2017, 08:55:11 pm »
Guys any one have the complete guide with pictures, I have and M-TDI, and need to put the petrol rpm gauge in my cluster but ive been told that is needed to change somethings to make it work with the w terminal, and them i was sent here to this post, any help please?

Reply #143September 01, 2017, 09:39:30 pm

libbydiesel

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #143 on: September 01, 2017, 09:39:30 pm »
Use, abuse or ignorance of any information is at your own risk, confirmation or refutation is your own responsibility, no further 'proof' will be given, take it or leave it, YMMV,terms subject to change without notice, avoid contact with eyes or skin, contents known to cause cancer in California

Reply #144February 09, 2018, 03:55:57 pm

protofuria

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #144 on: February 09, 2018, 03:55:57 pm »
Hi guys!

I know this topic is old and probably dead, but I'm trying to put a MK1 gti cluster into my '86 diesel caddy. Most pictures here have disapeared (thx photobucket!)

anyone could help me with it? here's a picture of my circuit board :



« Last Edit: February 09, 2018, 04:33:57 pm by protofuria »

Reply #145February 09, 2018, 06:31:11 pm

libbydiesel

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #145 on: February 09, 2018, 06:31:11 pm »
http://www.vwwatercooled.com.au/forums/f28/how-tachofy-your-mk-1-diesel-31515.html

You'll have to trace out your board (front and back) but they are all basically the same schematic and require the same replacement items. 
Use, abuse or ignorance of any information is at your own risk, confirmation or refutation is your own responsibility, no further 'proof' will be given, take it or leave it, YMMV,terms subject to change without notice, avoid contact with eyes or skin, contents known to cause cancer in California

Reply #146February 15, 2018, 06:39:20 pm

regcheeseman

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #146 on: February 15, 2018, 06:39:20 pm »
Can't believe this thread is still running, only popped in to borrow the pic links but thought they may have been ruined by photobucket.

Use chrome browser and apply the photobucket fix and all the pictures reappear - if anyone does want the originals please email me regcheeseman AT btinternet DOT com

Reply #147April 29, 2018, 12:18:34 pm

InSaneVw

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #147 on: April 29, 2018, 12:18:34 pm »
83 Rabbit LS with a 1.6TD

I was wondering if anyone has come across the tach needle not moving at all when done the conversion?  I have followed the board changes, got confirmation that I have 8v AC from the W terminal.

Traced the line from the Alternator to pin #5 on the 18 pin connector that plugs into the cluster and have continuity thru said line. Traced the pin# 5 on the back of the circuit sheet which goes to what I'm 99% sure is the Signal post on the tach circuit board. ( I used the 83 GTI circuit sheet ) ** Is this my mistake? ** looking at them all I see is that the 2 circuits that went to the clock back were cut at the factory on the GTI one.

The cluster has power ( lights, fuel and temp gauges work ). Next step is to take apart and triple check my circuit board work.

Reply #148April 30, 2018, 10:11:37 pm

srgtlord

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #148 on: April 30, 2018, 10:11:37 pm »
Silly question but did you run a line from the W terminal on your alternator to the signal input on the cluster?

Reply #149May 04, 2018, 12:30:15 am

InSaneVw

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #149 on: May 04, 2018, 12:30:15 am »
Yes ran a line from the 'W" terminal to the non used pin#5 line which is the tach signal. confirmed voltage and continuity all the way up to the cluster. Might be the voltage/tach stabilizer guess ill have to meter that as the needle does not move at all. Just curious if everyone keeps there stock circuit sheet or use the GTI one.

 

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