Magnum and Wiring Swap

So, what is actually "needed" out of the donor harness to make the Magnum run? I would imagine it's a little different between obd 1 and obd 2? Following along, thanks for the info!!

For obd2, if you use the original engine harness and PDC from the doner vehicle, all you need is power to the input of the PDC, an ignition hot and a ground. Then a start signal.