96 3500 Duramax swap

I am swaping out a 454 for a 05 duramax and allison tranny. I have the engine and tranny installed and I have the engine wiring harness and computer. I need info on hooking up the wiring harness for the gauges, dash and heater controls. Any info would be appreciated.

where are you located? i'm actually thinking about doing the opposite. (6.5td to 44 gasser) in my 95 3500. i could use the motor and wiring.