ready to fix tach
Thread Starter
Instructor
Joined: Aug 2007
Posts: 138
Likes: 0
From: san antonio Texas
ready to fix tach
my 79 tach has been stuck at 2000. what is the best methodolgy to troubleshoot the issue? replace tach circut board?
Last edited by cruise83; Dec 24, 2007 at 08:55 AM.
Drifting
Joined: Oct 2007
Posts: 1,458
Likes: 1
From: Collinsville MS
St. Jude Donor '08
First check and see if there is a tach filter between the distributer and it. Should be under the hood plugged into the distributer. will look sort of like an old points condenser. If there is one, I would try bypassing it first before I did the tach board.
Le Mans Master
Joined: Oct 2005
Posts: 6,247
Likes: 471
From: Glen Allen, VA
Contact board member ACECO. He fixed the circuit board on my tach in my 79. Mine read too high, and his fix was cheaper than a new circuit board. He's very honest and great to deal with.
Race Director
Joined: Oct 2000
Posts: 11,891
Likes: 3
From: Kansas City, MO ...I'd like to go fishing and catch a fishstick. That'd be convenient. - Mitch Hedberg
I've chatted privately with a few forum members in the past about our circuit boards. The tach works great after the new part, except under heavy acceleration, the needle goes to zero like it's dead. Let off the go pedal and normal services resume.
Either way, getting the circuit board out is easy. Changing it is even easier.
Either way, getting the circuit board out is easy. Changing it is even easier.
Thread Starter
Instructor
Joined: Aug 2007
Posts: 138
Likes: 0
From: san antonio Texas
thanks for the advise! I took apart my speed/tach lens, unscrewed the tach face and it looked like a fire was present...black residue on the green plastic...did not know the circuit board could flame.
where is the best place to get a board quickly...my son wants the vette back to drive!!
where is the best place to get a board quickly...my son wants the vette back to drive!!
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Brett Foote
Team Owner
Joined: Jul 2006
Posts: 22,167
Likes: 4,172
From: Kannapolis NC
I've got a brand new tach board precalibrated for a 78/79. Never been installed. PM me if you're interested, I'll sell it for $65 plus shipping. I'm taking a $10 loss, but I found the problem with my tach before I changed the board. If your tach is stuck on 2k even with the switch off, you may have other problems, it should go to zero when you turn on the switch if you have 12 volts going to it. Maybe the 12 volt line is what burned? Anyway, let me know if you need the board I have. Good luck.
