Great thread, and I'm going to follow along as I am gathering parts to swap a 98 5.9 Magnum into an 88 D100. I have a low mile motor, along with all of the under hood wiring. I need to find a wiring diagram from 98 3500 5.9 Magnum 5 spd truck, so I can try to figure out what I need to make it run. I also need to find out if I need the OBDII port from the same type truck, since I didn't get that. Lots of good info in this thread already!