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Author Topic: Gas Tacho / Revcounter Conversion to Diesel W terminal  (Read 115128 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

 

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