i can understand you want to do some quick test but you oughta recharge it w/ a kit and try it. its a cheaper insurance than tryin to wear out ur compressors motor/pistons.
you can try it though, its ur car:
cant remember exactly where it is but its along the low-line (big line). two wire switch. not sure how the switch work at workin pressure, normally closed or normally opened. you can cehck it w/ a DMMeter. hope thats clear enough.
o0 4Runner, Sequoia Wheels on 265/70/16, Airlift, Denso 4300K, 199mm Brakes
Techstream V5.0 w/ Openport 2.0