67 twin turbo dart

I had the same problem with my Megasquirt. Too much voltage drop when cranking so I feed my MS with a constant 12v armed with a toggle switch.

Yeah I had to do that too, this is just the coil power off the fuse panel when I rewired the car for its power source and the ignition power which to power the Cam and Crank position sensors. But the main power feed for the injectors is off a relay that I put in but that trigger wire is only on with key on and not cranking.