1975 tach problem
Thread Starter
4th Gear
Joined: Nov 2009
Posts: 4
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a little more info..... The tach sits at zero with no power or key in the ign. When I start the engine, the tach moves toward negative numbers(towardthe 7000 rpm mark) As the engine speeds up, the tach moves toward 6000then 5000.
Still looking for help. No obvious loose wires. Has anyone out there seen this before????
Still looking for help. No obvious loose wires. Has anyone out there seen this before????
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
Yes I've seen this before! You have a board issue! The only way for the tach needle to go to zero when the key is turned on is for it to have power and ground. The only way the needle will move is for it to have a input signal. If the needle is moving backwards, you have an issue with the board itself.
I don't have the links up for the 75-77 tach boards just yet!
The new 75-77 boards were completed last week for final testing and the link should be up real soon! Actually in a matter of days.
Willcox
I don't have the links up for the 75-77 tach boards just yet!
The new 75-77 boards were completed last week for final testing and the link should be up real soon! Actually in a matter of days.
Willcox
