Anyone using stock ECM and harness?

I'd love the information please!!!
I'm struggling with how to make the 2005 truck harness work in my 1970 Duster. I've got the tipm and the 05 pcm and am using the 545rfe transmission. I was also wanting to use the instrument cluster from the same truck. The Dusters lights, turn signals and such will remain as is from the factory. I could definitely use some guidance in getting this thing to run. Please!