'77 Tach problems
Thread Starter
6th Gear
Joined: Jul 2008
Posts: 6
Likes: 0
From: Kentucky
'77 Tach problems
Tach started bouncing for a while, then stopped working. Bought and installed a new Tach Filter and it's still not working. What are my next steps to diagnose the problem? Hoping that dropping the dash is not going to be required.
Le Mans Master
Joined: Sep 2002
Posts: 5,236
Likes: 898
From: Myrtle Beach SC
Here's a technical article that still rings true in regards to what one needs to know when replacing a tach board.
http://hunt4cleanair.net/Articles/tachboards.pdf
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,851
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
However, before I pulled the dash I'd take the filter out of the equation. Unplug the filter from the system and plug the tach directly to the distributor for testing. If you unplug A and plug it straight into the distributor you'll either prove the filter is the issue or eliminate it as the issue.
Here is all the tach info on my tech site for 77
http://repairs.willcoxcorvette.com/?yt=1977&s=tach
Last edited by Willcox Corvette; Jul 30, 2018 at 03:44 PM.
