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Message: <blockquote data-quote="GREG@SN95" data-source="post: 819557">Vehicle is a 91 f150. Does anyone know how to wire up the tach or how these things work?The truck originally had an EFI 302 with m5od. The pushrods were bent by previous owner and I got a screamin deal on a mercruiser 351 small block. The motor is an 86 with a 4 barrel carb. I have an MSD blaster 2 coil on it and the dizzy is a marine presto lite with mechanic/electric advance.I would like to have a working tach... I looked at a wire diagram in a haynes book and tried hooking the ground wire for the tach to ground and the other to the hot side of the coil but it did not work. I'm horrible with wiring, I don't understand diagrams real well... and I'm assuming that the tach runs off the ecu... Any help would be appreciated, thanks...</blockquote>