1987earthquake

iTrader: (9)

I've done some searching but all I can find is Autometer threads. Well I bought a set of Marshall gauges. My question involves the speedo. I can accept both types of signals. Is the output of the pcm for the speed a square wave signal? also how many ppr is the tach signal?

Thanks,
Eric B.

TomH

iTrader: (1)

Speedo is 4kpulse/mi square wave and tach is (generally) set as if it's a 4-cyl. (Set during programming of ECM)

Good luck.