A/C Piggy?

[ItzGenX]

Ok, lets start this off from step one. I am doing an S13=>S14 chassis motor swap. Like all good things, there is a con, no a/c. Like most people, I want to be greedy and have it all. I plan on piggybacking my KA ecu just for the a/c. What I would like to know is, what wires are NEEDED for the ecu to do such a task? I want to cut off the rest of the wires and give them a good fairwell so I have less confusion with the rest of the harness as I get the S13 harness in there. Is it possible? Does anything else need to run to the KA ecu besides all 8 a/c system wires and the ecu power/relay?