[quote=Sniper]To be honest, they didn't have to have a 5v setup. there are ways to have conditioned the old style signal to be compatible, but it was cheaper to go the way they did if they were already adding a bunch of sensors and such that used 5v. I am putting a dual TBI setup on my 51 Plymouth's flathead and am using the old school mopar electronic ignition distributor guts from a /6 in my 51's distributor as the ignition trigger. [/quote

I just meant once they went to 5 volts to work all the sensors as you said then it was easy to go with Hall Effect. Good luck with your 51 as it sounds like a cool ride. Ron