Odd tach issue
Thread Starter
Racer
Joined: Feb 2018
Posts: 254
Likes: 73
From: Chicago, Illinois
Odd tach issue
Hey guys, I have a question. My 76' which has its factory electronic tach, has an issue that i'm not sure how to fix. When the car is cold the tach sort of works but only gives an accurate reading up to about 2200 RPM. When the car warms up the tach stays between 650-1200 RPM and just flutters no matter engine speed. filter plugged in/not doesn't make a difference, I'm not sure of the board being the culprit because it does still kinda work. I don't really want to shoot the parts cannon at it, so if anyone has a suggestion of whats wrong with it please let me know
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,853
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
Sounds like it's either the board or the movement itself. I'd start with a board.
There is a ton of info on my tech site. http://repairs.willcoxcorvette.com/?yt=1976&s=tach
There is a ton of info on my tech site. http://repairs.willcoxcorvette.com/?yt=1976&s=tach
Thread Starter
Racer
Joined: Feb 2018
Posts: 254
Likes: 73
From: Chicago, Illinois
Sounds like it's either the board or the movement itself. I'd start with a board.
There is a ton of info on my tech site. http://repairs.willcoxcorvette.com/?yt=1976&s=tach
There is a ton of info on my tech site. http://repairs.willcoxcorvette.com/?yt=1976&s=tach
Le Mans Master
Joined: Sep 2002
Posts: 5,236
Likes: 898
From: Myrtle Beach SC
My 78 has a Wilcox tach board in it as well! 
If you wish background on 75-82 tach boards, check this out!
http://hunt4cleanair.net/Articles/tachboards.pdf
If you wish background on 75-82 tach boards, check this out!
http://hunt4cleanair.net/Articles/tachboards.pdf
