A/C Compressor won't shut off when pressure gets very high...

I replaced some lines that I'd been delaying since last year, took it up to have it charged, ok... I get it back with full charge, but....he tells me that the compressor isn't cycling on and off like it should, and I should do some investigating on that, I have 3 electric fans, none of which turn on as soon as I hit the a/c button, but one comes on come on as soon as the thermostat opens and puts warm coolant in the radiator, and the other comes on as it gets a little warmer. Once the fans kick on to pull some air through, the pressure drops to a reasonable level. The problem is having it on before the car gets good and warmed up, and sitting still with little air flow..... Isn't there a high pressure switch on our cars that should cycle the compressor on and off? I guess that's what I'll be looking at next, unless there's something else anyone else can think of?.. I don't have WIS here at work with me, I'm just trying to get some more ideas if there are any.

Thanks for any info.........



edit: I do see two different pressure switches on Eeuroparts, which one detects high pressure and is there a test I can do with my multi-meter?