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Topic: Tachometer not working

in Forum: C3 Engines

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Tachometer not working (1/3)
8/1/07 6:05pm

engineguy63
Former Member
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Easthampton, MA - USA

Vette(s):
1970 corvette conv, 350 auto.

Joined: 5/27/2007
Posts: 114

OK Guy's I was gonna wait till winter to bother with this one, but, I am gonna try to get it done while I still have a couple$$. When I bought the car (1970 red vert) the tach was not working and as I understand it ...it has not in a while. Looks like a cable just goes into the distributer, can I just unscrew it and test it to see if the cable is broken...maybe with a drill to try to turn cable and see if the tach indicates speed?? Is there a common problem with these, or is the tach itself likely to blame THANKS!!!

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Tachometer not working (2/3)
8/1/07 7:59pm

Adams' Apple

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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 20201

You can remove the cable from the dist and spin it with your fingers or a drill to see if it works.
It is common for the cable to twist the end off, especially if the cable gets in a bind where it comes out of the dist.
Check the cable ends first by spinning it with the drill(or fingers), then, if the tach moves like that, the gear is probably damaged in the dist.

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Joel Adams
C3VR Lifetime Member #56
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Tachometer not working (3/3)
8/1/07 8:38pm

74-454

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Canada

Vette(s):
Coupe 74 - 454 Drive it like you stole it!

Joined: 8/6/2004
Posts: 533

What Joel says is by far the easiest/quickest test you can do to narrow down the problem.

If you find out that you have to replace the cable (probably cheaper than a dist. gear; if easily serviceable), I hope you have small hands! Wink

I found out when replacing my speedometer cable that a second elbow on the same arm would be so cool Cool

to reach it behind the console.

74-4542007-08-01 20:39:28

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