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07-22-2023, 07:09 PM
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425hp409
 
Join Date: Oct 2008
Location: Prosper Texas
Posts: 841
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Tachometer calibration
I have three tachs and none of them read accurately when hooking them up to a running car with a known good tach connected to the engine. One is slightly high and the other 2 are about 20% fast. Is the small screw on the top rear of the tach a calibrations adjustment?
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Charles 68 SWB, Dad bought new, now 396 & factory ac 64 Impala SS, 409 425HP, 4 speed AC 64 Bel Air Wagon, 400 Small Block 57 Bel Air all original 283 w/Factory Air 77 GMC Sprint, 454/425HP 67 Olds 442, all original 90 ZR1 Corvette |
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