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I have the red-light green wire from the firewall, the red wire from the distributor, and the red wire from MSD all tied together right now and when I get the adapter, I tie the red one from the adapter to the other 3?

Thanks Don, that made a lot of sense, do you have any experience with the Rocketman Conversion?

Alright, thanks guys. Ill let you know if it gets working when i get the part.

I've been told there is a flat 4 pin connector coming out of the firewall and the second is the tach trigger wire. I believe it's red with light green striping on it and I have it tied in with the red wire from MSD and orange from distributor ignitor. If I unplug it the car will not start, just...

Do I need to do anything with the ballast resistor?

So I will for sure need the 8920 adapter? I'm sorry I sound so noobish on this.

I have a 72 Mustang mach 1, i just recently installed a MSD 6AL and a MSD Blaster 2 Coil. Distributor has a Pertronix ignitor kit in it and it is the factory Tach. The tach was working perfect before the MSD box installation. The tach will read about 200 at idle and slightly go up to 300 when...