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Re: Tachometer calibration
I have a factory tach (not reproduction) and HEI. I temporarily installed an aftermarket tach and adjusted the factory tach to match. Without AC, I was able to reach up behind the cluster and adjust the screw on the back of the tach; it doesn't take much to make a big adjustment.
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'05 Chevy 2500HD 4x4
'72 GMC LWB 4x2 driver
'72 Chevy LWB 4x4 plow truck
'71 Blazer 4x4 driver
'70 GMC LWB trailer
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