If it's got its power connected correctly and the input wire connected to the (-) coil contact (for points ignition), or the "TAC" terminal (for HEI), than I'm guessing the tach itself. Have you had it refurbushed??? The originals are notorious for giving up the ghost. The tracings on the circuit board pull away and the spring tensioners on the needle get out of whack.
tach not working
Just installed gauge cluster and we have everything wired correctly but the tach still won't operate. Any ideas?
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