79 tach problem

[roadking]

i recently purchased a 79 vette, l48..the tach was not working properly as it started at 3000 rpm and moved slightly upon acceleration. i removed the tach and replaced the circuit board at which point it did not move at all..upon inspecting the tach i noticed it had an l82 on the face...can the l48 and l82 interchange?...any ideas?..i was thinking about replacing the whole unit but unsure if i have other issues...thanks

 

[Copdogcorvettes]

I'd replace the tach filter before doing anything else.

Gary
SAVE the WAVE

 

[bagger]

tach problem

Hi Roadking. In the March 2010 issue of Corvette Enthusiast, it has an article on 75-82 electronic tach repair. It give reasons why the tach went bad and how to diagnose and repair. If you can find yourself a copy, it might help you solve your problem. If you go to their website, you might be able to view it. Good luck.

 

[roadking]

apprciate the response..new at this....attempted to locate filter but unable to find...appears no filter

 

[Copdogcorvettes]

apprciate the response..new at this....attempted to locate filter but unable to find...appears no filter

It looks like a condenser and mounts on the manifold. Trace the wire from the Tach terminal on the dist.

Gary

 

[roadking]

traced the wires but unable to locate

 

[Copdogcorvettes]

If no tach filter it's not going to work right and you could fry the board.

Gary

 

[cleon]

I have on on my 1979 I replaced about 1 year ago. Changed to MDS and no longer need it. if you would like to try it let me know. Otherwise it will probably end up in the trash.

 

[Copdogcorvettes]

I have on on my 1979 I replaced about 1 year ago. Changed to MDS and no longer need it. if you would like to try it let me know. Otherwise it will probably end up in the trash.

OH Please, don't throw it away! Give it to someone that can use it. Aftermarket they cost around $50 to buy a new one. :bash

Gary