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Re: Tachometer calibration
I just thought i would provide my findings i have with 2 used original 8cyl tachs. i am running a v8 with original 70's era GM HEI distributors. the tachs work fine and read pretty accurate(maybe out by 100 or so) when comparing to my multimeter. like 425HP409 has stated, it seems they operate off pulses from the distributor, so as long as my HEI does not wreck any of the original Tachometer circuitry, im happy to use them!
I do however have a 3rd original tach that seems to want to read over 500 RPM higher in all ranges, so im thinking its a problem with the tachometer or an adjustment, (the zero adjustment is good tho)
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