67 318 magnum swap

I was under the impression that all of your sending unit and sensor information was sent to the PCM. Everything was interpreted there to efficiently operate the timing and fuel injection systems. The information was then sent to the Power Distribution Center PDC (fusebox). From the PDC the CCD bus signal (binary) was directed to the interior. I thought the CCD was deciphered there and the individual signals went to the respective gauges. I do know that most of the interior functions such as dome light, electric seats, fan motor, etc are fed by the Body Control Module (BCM).

I didn't use the BCM, instead I used the power feed from the fusebox (PDC) to power the original underdash fuse panel. The PDC contains most of the relays necessary for fuel pump, headlights, automatic shutdown relay, air conditioning, etc.

I agree with Player1up. If you have the Power Distribution box from the donor vehicle - use it. Wiring the PDC will be a lot easier than figuring out how to wire the new alternator, relays, sensors,etc. So far, I have installed the original wiring harness without cutting the harness at all. The harness from the truck going into the cabin was cut when I got the engine. That's all that I have used to rewire the ignition switch, headlights, stop lights fuel pump, data link connector, and original fuse panel.