on borad air
 

my cherokee doesn't have ac pump but i'm going to the junk yard to get a ac pump and i was wondering what i would have to get to make the on borad air system

Try a search. Found this with just a few min of searching.

http://home.kendra.com/xjdlgill/converti.htm
http://www.jeepforum.com/forum/f37/s...ard-air-58213/

To be fair you can get lost looking at OBA info. Heres the best writeup and info for converting different Sanden compressors into OBA systems. Read the entire thing and you'll be set.

http://www.s10forum.com/forum/f125/o...thread-215865/

Get this..some of these guys are running 300psi and have no pre-oiler in the intake air. Instead they're running gear oil in the compressor crankcase.

The stock 508 compressor works great for OBA systems, just get one off a JY XJ, and your off to a good start.