JDSHOCKEY

Hello, I am new to this site and if you are looking at this post thank you for your time. I have 1979 dodge power wagon that had a trashed and I mean trashed wiring harness under the dash so I found a good used one from a 1979 or 80 mode. l removed my dash from the truck and installed the new harness it doesn't have the dual tank switch plug or A/C . I have some plugs left over that look like they are essential to my project, but my Knowledge well lets say I might be over my head . Any Ideas on what these are and what they go to?
Thank you JDSHOCKEY