Switches should be the same.
Below 40 deg. or so, the saturated pressure of the R134a (or r12) is so low that the low pressure switch doesn't allow the compressor to come on. As the engine compartment and passenger compartment warm up, the pressure will be high enough to enable it. Variations in pressure switch mfg. (you know all our parts are highest quality :rolleyes: ) means the actual pressure the switch breaks or makes can vary, ie YMMV.
