Al, I didn't install a diode. After the upgrade of the alt I fired the car up to make sure i didn't screw anything up and all seemed to be good. No alt light on in the dash and it shut off like normal. There's already some sort of diode or some little doohickey in one of the wires leading to the old voltage reg. Maybe the instructions say you need one if ones not already there.

Jman, I always used the signal for my tach from that one plug on the end of the MSD box run straight to the tach. With the Holley wiring they utilize that connection for a signal to the ECU and a dark brown wire from the ECU to signal the tach( supposed to be a square wave signal). I'm hoping it works like it used to. I'm still running my HEI with no timing control till I get this thing up and running. Once I get everything sorted out I'll attempt to switch over to the other Dist.