You may or may not have seen this sync video, but thought I'd drop it in here for you so you don't have to hunt it. Hope it helps. Good job on the harness! I'm going to put a low mile 1998 5.9 Magnum into my 88 D100, so I gotta figure all that out too. I have the complete wiring, computer and fuse box from under the hood of the 98 truck.
Thanks for posting this video. He really explains the process well. Someone posted it in another thread an it's how I set the engine to mechanical zero.
Thanks, the harness was time consuming. I worked on it when I had time. It took about two months a few hours at a time. Having good schematics and a complete harness helps. I had read that the Ram's ground the headlights back at the headlight switch. Check your schematics and confirm. I ran into some weirdness with wiring in the original foot operated high beam switch into the high beam selector from the multifunction switch. The Dakota's selector wire keeps the switch 12V/hot at all times for the flash function. With it going to the foot switch, it made the headlights stay n regardless of headlight switch or high beam position. I removed that wire and picked up the high beam indicator source from the high beam output wire.