Topic: tack reads double
in Forum: C3 Electrical
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the tachometer in my 78 suddenly started reading double the actually RPM's. The car runs fine and I borrowed a tach from my other Vett. It has to be an electronic component (there are only a few components, and naturally the components are not stamped with part numbers). Does anyone have a schematic diagram or electrical parts list for the factory tachometer in a 1978 vett?

Annicorvette
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Castle Rock, CO - USA
Joined: 4/21/2002
Posts: 179
Vette(s): 1973 T-Top
1993 Coupe
As I recall, all the components that are electronic are inside the tach. Did the other tach read double as well, when you hooked it up?
Alex
Alex

when I switched the tachs around the good tach still read correct and the bad tack still reads double except at the engine off position when both tachs read the same



Annicorvette
Lifetime member # 35
in Forum: C3 Electrical
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