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Topic: HEI and TACH

in Forum: C3 Engines

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HEI and TACH (1/3)
7/14/15 1:21pm

LRPGCP
Former Member
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orange park, FL - USA

Vette(s):
1978 25th Anniv numbers matching

Joined: 7/14/2015
Posts: 3

The Tach and the HEI (aftermarket) are not happy together. Tach shoe 6,500 at Idle. I just ordered a full HEI from Ecklers, cap, rotor, coil. Will this make the tach happy?

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Re: HEI and TACH (2/3)
7/14/15 1:25pm

Adams' Apple

Lifetime Member
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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: 20128

Most likely a problem with the tach filter. It was probably dis-connected when the aftermarket HEI was installed. Check to see if there is a spare/unused connector coming off of the "Tach" plug/terminal on the distributor cap. This wire will go down a few inches, and the tach filter will be in-line with that wire. If there is nothing plugged into the "Tach" terminal on the distributor cap, that means the tach isn't even plugged in. Thumbs Up

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Joel Adams
C3VR Lifetime Member #56
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Re: HEI and TACH (3/3)
7/14/15 1:32pm

LRPGCP
Former Member
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orange park, FL - USA

Vette(s):
1978 25th Anniv numbers matching

Joined: 7/14/2015
Posts: 3

Tack is Plugged in, did not Notice that wire you are talking about. Hope PO did not cut it. Car is at my hobby shop in S.C.

Thank you for the reply.

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