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Okay, so this is not a Chevelle question, but I am hoping someone can help me. My son drives a 1965 C-10 pickup with supercharged 350 and M-20, and we just bought a factory tach and gauge setup, however, the tach is not marked for 12v or tach lead. There are only two studs on the back and appear to be identical in appearance. Does anyone know which lead is which? I am trying to do this without any bad surprises. Thanks
 
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