1975 tach
Thread Starter
Racer
Joined: Mar 2015
Posts: 492
Likes: 40
From: SE Ohio
St. Jude Donor '16-'17-'18,'19
You are right. I was going to reset the needle but I think I have to tear the dash out to do that too.
Thread Starter
Racer
Joined: Mar 2015
Posts: 492
Likes: 40
From: SE Ohio
St. Jude Donor '16-'17-'18,'19
No, turn the key on it goes to 7000, start the car it goes to 600 (cold idle), after warmup it drops to below 0 at idle, rev.it up or drive it and it works but is about 1000 RPM low, shut the engine off and it goes to 5300.
Bob
Bob
Le Mans Master
Joined: Dec 2007
Posts: 6,422
Likes: 591
From: McHenry Illinois
If it's original, it's amazing it made it this long. By the time you take out and disassemble the tach to reset the needle, you might as well put in a new circuit board. The best out there is from Willcox.
Le Mans Master
Joined: Sep 2002
Posts: 5,236
Likes: 898
From: Myrtle Beach SC
As 75 states above...Wilcox does it right and their support services are superb!
Tach Boards
Last edited by hunt4cleanair; Feb 5, 2017 at 04:43 AM.
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Thread Starter
Racer
Joined: Mar 2015
Posts: 492
Likes: 40
From: SE Ohio
St. Jude Donor '16-'17-'18,'19
Here's a techie tach board article I wrote some time back but it give you the background on tach board technology. Essentially, circuit components and copper paths deteriorate with time. In fact, your 75 was the first year for HEI...and board design changed several times until engineers figured out how to improve them. Copper paths too thin, etc.
As 75 states above...Wilcox does it right and their support services are superb!
Tach Boards
As 75 states above...Wilcox does it right and their support services are superb!
Tach Boards
