air compressor conversion

I'm looking for conversion data on my 92 4 door laredo cherokee.
I pulled my A/C exchanger this weekend and am seeking pointers on converting my compressor over to a trail air setup.
I remember in the old NAXJ threads, reading some of this material.
Can anyone direct me?
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Did a search for ya

http://www.off-road.com/jeep/cherokee/2001/05_may/onboard-air/onboardair1.html

Good Luck