5.9 Magnum motor and retrofit wiring harness EFI setup, ready to drop in and run

It works independently of the transmission. All it needs is the neutral safety switch to be plugged in, or grounded.

Most guys I built these for over the years were using the 904 or 727 transmissions. If you want to use a 500/518, you'd just have to wire up an overdrive switch to it.