Corvette Tachometer
Instructor
Joined: Aug 2017
Posts: 140
Likes: 19
If its a c3 then there are alot of different possibilities...first is the tach wire going to coil, is it an hei coil? Also, corrosion in the instrument cluster....pull it all apart. These cars all tend to leak at one time or another and water gets into carpets which in turn causes all kinds of bad connections inside of dash and cluster. As carpet dries it causes condensation everywhere up in the dash.
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,850
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
What year is the car? I've got tons if info on the operations of a tach for the C3 cars on my tech site. http://repairs.willcoxcorvette.com/
