I agree with Gordo, check the electricals first.
And yes the pressure switch will disable the compressor from engaging, preventing damage to itself and the whole system, if the level of refrigerent is too low.
I wouldn't recommend trying to jump a wire to the compressor to see if it is working with the engine running, but you can try it with the engine off. This will show if the compressor electromagnetic clutch is working. And if it doesn't engage while engine running, of course check the electricals.
Good luck man, I feel the heat of summer already, and I see why everyone wants the A/C to work. 
__________________
Pat Albaugh, Midwest Moderator
"Diffage" -the point at which the truck's differential makes contact with the ground.
http://www.cardomain.com/id/RageRover42Visit my RRC and others here!(updated as of September 15, 2006)
1995 RRC LWB
-LT265/75R16 Pathfinder All Terrains
-RTE 2" Lift Springs
-Pro Comp ES9000 Shocks (from DAP Enterprises)
-KMC Front Diff Guard
-4 Desert Fox 55 watt Lighting
-Radio Shack CB Radio (never know when signal fails on a cell phone)
-2 Halogen Super Sport 100 watt forward lights
-Custom slim style front bumper w/ integrated bull bar
-Lowe's Special "Homemade" Snorkel
-T-Case out of an 92' RRC
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