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Tachometer Calibration
I've recently become a partner in an old Sea Ray with twin 5.7 V8 inboards. We've noticed some disparity between what the tachometers are reading and what the sync gauge is reading. I believe the tachometers and sync gauge are reading each 12V signal from the EFI box to the coil. I plan on taking some frequency readings with my DVM on the individual tachs at various RPMs and compare the Hz with the needle on the gauge.
Can someone confirm that 1000RPM = 66.667 Hz? This is based on 4 coil pulses per revolution (4px1000rev/60sec).
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