Anybody know what form the signal takes from the tach drive (alternator) on my 95 Suburban 6.5? I need to know how many pulses per revolution in order to adjust my new Quick 4 transmission controller to match the speedometer output. Everything's working fine, shift-wise, except that I'm showing codes on the display, indicating that I have slippage which doesn't exist.

If I know the frequency (pulses) I can enter the program and chose from the list (4 pulses, 8 pulses, etc) and match them up using the calibration program.