My tach quit out of the blue the other day.I ordered a new board today from Zip.Any suggestions on precautions I need to know to make the switch be succesful,also the capasitor on the engine,What exactly does it do and could this also be part of the problem? any help would be appriciated.

 

Here's a how to article. It's an easy fix. The cap on the engine is for radio noise suppression. Shouldn't have anything to do with tech.

Gary

http://www.corvettemagazine.com/Inte...er-repair.html

Wilcox even has a video.
http://forums.corvetteforum.com/c3-t...m-willcox.html

 

This forum is the best!!!

 

Thanks for your help

 

This is copied from another thread, I hope this helps you too!



The tachometer in your car works off 12 volts, a ground and what is called a square wave signal generated by the distributor. The 12 volts and the ground are supplied to the tachometer by the printed circuit on the back of the speedometer and tachometer housing. The signal is supplied from the distributor through a filter and then straight to the tach.

Before you pull the tach out of the car lets test some things real quick.

un-plug the tach filter from the system and plug the tach in direct! This will take the filter out of the system.. Start the car and see if the tach works.

Here is where you'll find the filter.


If the gauge works from by-passing the filter then you should replace the filter.

If the gauge fails then pull the tach/speedo housing from the car and go to this step by step page on how to figure out the problem. It will tell you how to remove the tach from the car in a matter of minutes and also take you step by step on how to determine if you have a wire issue or a board problem. This was updated recently with new pictures and details!

http://willcoxcorvette.com/repairand...lp.php?hID=290

If you get to the point where you need to replace the board, we have a video on youtube which will show you step by step on installation as well as how to do the zero set.

18243


Willcox

 

Was bored at work today, so decided to do some quick searches. Stumbled across this post.

Just want to say thanks Wilcox. I did the filter bypass test and the tach started working. Looks like I need a new filter.

Next step, speedo.