Anyone have one these in their truck

[truckin 79]

I found this at the local junk yard, it is a aftermarket AC evaporator for a truck that only came with heater core. I picked up the unit ac/heater switch controller and ac bracket for the sanders type of compressor for 50.00. I dont know if I will ever add ac to truck but this seems a lot easier and cheaper then stock or aftermarket stuff. Anyone have a set up like this or more importantly the wiring diagram since everything was not hooked up. Thanks for any help