Ok, when I turn my A/C on my oil pressure gauge shoots all the way to maximum, and my temp gauge goes way up, even when i know its not hot because i just started the truck. Any ideas why its doing this, i just put R-134a in my truck yesterday, so this is the first time ive got to try my A/C in the heat.

 

Sounds like you may have a wiring/electrical issue. When you turn the A/C on, does it peg the gauges right away? Or is it a slow reaction, like the motor be stressed?

Pull the sender out and use a hand held gauge to get an actual pressure reading. Use a thermometer, either a laser one or a gauge in the radiator, to get an actual temp as well.

 

Its electrical, turns out its the fan, not the ac though, this explains my other gauges going out...

BTW i suck at electrical, so i think im screwed here.

 

Your oil pressure isnt actually shooting up because your oil pressure gauge is nothing but a dummy light. If its getting at least 7 PSI, your gauge is in normal somewhere. If its in the high area then its just a faulty gauge or wiring problem.