Ok, heres some tips for ya Zabeard. I did my install about 5 months ago now, so I've gotten all the "bugs" worked out.
Your A/C relay should be on the driver side of the engine running from the cab to the compressor. Did you get an adjustable thermostat? If you did just pull your truck up close to a wall or garage door and let it idle for awhile, once your gauge starts to go past the half-way mark the fan should kick on. If you have an adjustable thermostat and it DOESN'T kick on at that point, adjust until it does. This process could take you a couple of days worth of getting the truck hot, adjusting, etc. It took me 3 weeks or so until I got it perfect.
I'll get some pics of mine ASAP, been meaning to for awhile now...ok its been 10 minutes and I took my lazy a$$ outside and got some pics finally, the last two are of concern for the A/C relay!