MSD conversion

 If you hate the MSD red, tape off the terminals and paint the MSD distributor cap Ford blue engine paint-I found VHT paint works best(or whatever color you desire), I've been doing that for a while since using Accel dist caps(they have brass terminals)don't like the tan color . The TFI coils require full 12V at start and in run. When I cobbled together my ignition system, I used the original resistor wire to trigger a relay that sends 12V to my TFI coil, even with reduced voltage output it still energizes the relay and can easily be converter back if later in life you want an all Duraspark ignition. Hope this helps 

Eliteman76 wrote: I just wish I understood what FoMoCo was thinking with the 72-early 73 cars and the Positive ground versus the 74-79 cars on the tach. Sitting here trying to make sure I get the correct tach driver for this.

maybe the 1st time i've heard it referred to as positive ground? what it does is the coil power flows through the tach, thus only 2 wires In & Out. the later 3 wire tach is similar to aftermarket tachs that use switched 12v power, a coil + signal wire and ground. i don't believe there is a way to use the Ford 2 wire tach with MSD? either swap out the 2 wire tach for a later 3 wire or get the 2 wire tach converted by a gauge outfit with an aftermarket make-it-happener