I'm thinking 200psi is what I need? (NAPA# TEM 207107)

http://www.napaonline.com/Search/Detail.aspx?R=TEM207107_0064051075

I just replaced my entire A/C system, but Carquest gave me a compressor-mounted low-pressure switch instead of the high pressure switch I asked for.. looks like rockauto has a similar part listing problem for the 97 blazer. My repair shop couldn't get the wiring harness to plug-in, so I told them by phone to jumper the high switch and charge the system. Oops- I thought carquest just sold me a high-side switch for a different brand/year, but it turned out the be a L/P cut-off that looked like my old compressor-mounted switch.

I'd like to leave my system charged and install a retrofit switch on the high-side port, but what is the cut-off pressure supposed to be? I can't find this info on google, but I keep seeing posts referencing working pressures of 235psi on the high-side... So 200psi cut-off would be correct since the switch only stays disengaged at >430psi ????

Also, how often does the H/P cut-off "typically" engage? I'm scared to manually run my A/C in cycles >5 seconds with the high side jumped, especially not knowing if my shop may have slighly over-charged the system. Probably time to buy a set of gauges...