Is anyone else's tach doing this?

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Nov 28, 2008 | 05:17 PM

Raphiki

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Melting Slicks

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From: Palatine, Peoples Republic of Illinois

St. Jude Donor '09-'10-'11-12-'13-'14-'15-'16-'17-‘18

NCM Sinkhole Donor

Is anyone else's tach doing this?

When I turn on the ignition the tach zero's out. The tach is dead on all the time it's running but when I turn off the ignition the tach spins around the dial like the wheel of fortune. I don't know it I should fix it or start taking bets! Any ideas?

Nov 28, 2008 | 05:50 PM

thiatt

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if it isn't broke.......

Nov 28, 2008 | 05:58 PM

...Roger...

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From: Dayton, Ohio

Never seen that before but I want mine to do it.

I dont think there is a stop pin on the face but I wonder if the meter is stopped inside somehow.

Nov 28, 2008 | 09:51 PM

Raphiki

Thread Starter

Melting Slicks

Joined: Jun 2005

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From: Palatine, Peoples Republic of Illinois

St. Jude Donor '09-'10-'11-12-'13-'14-'15-'16-'17-‘18

NCM Sinkhole Donor

It a '76(?) electronic tach which replaced the very annoying mechanical tach that came with the car. I suppose it isn't hurting anything but it is weird!

Nov 28, 2008 | 11:00 PM

TyCor

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From: Farifax Station VA

Check the connection to the disdtibutor...yellow and red wire enter on the drivers side of the dist. I would guess, the most likley cause is a grounding issue on the back of the tac circuit board. Is the '76 mechanical or electric tac. My '77 has a small circuit board I had to replace last year.

Nov 29, 2008 | 12:40 AM

gldnkngt

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From: Jupiter FL

Quote:

Originally Posted by Raphiki

Occasionally, the damping fluid in the meter head itself dries out and it has to be re-damped. Causes the tach to act goofy sometimes. That may be the problem. Just a thought.

Nov 29, 2008 | 10:09 AM

...Roger...

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From: Dayton, Ohio

Quote:

Originally Posted by gldnkngt

Occasionally, the damping fluid in the meter head itself dries out and it has to be re-damped. Causes the tach to act goofy sometimes. That may be the problem. Just a thought.

Bill,is the fuel gauge dampened the same way?I just replaced one that was accurate but the needle followed every move of the float in the tank.I was planning on an exploratory mission deep inside to check it out.