84 Ltd lx t5 8.8. I am in the final stages of installing a 347 with a pro flo 4 fuel injection system. One of the wire needs to be connected to a 12 volt switched power source that provides 12 volts when the key is both “on and cranking”. I know that I had it wired up to the switched power source on my previous setup, but I wired it 10 years ago and I have forgot a lot since then. The pro flo instructions state “do not connect the wire to the positive side of the coil”.