Good morning, all. I am going to redo my A/C again after a few stupid moves on the last round. (I had two unused compressors to play with, so its not costing me too much.) Now the original compressor and the first one I used have what looks like another pressure switch directly on it. While the compressor I am about to install does has the orifice for it, it doesn't actually have a switch. My main question is, what is this particular switch, and is it necessary? I assume it is since the original had one. Second, how do remove from one compressor? Does it screw in, pull out, what? Since it has a plastic connector for the wiring pigtail I do not want to try too many things for fear of breaking it. Thanks in advance. ---------- Post added at 09:30 AM ---------- Previous post was at 09:02 AM ---------- Okay, found it in another thread. Its the High Pressure Switch, and it pulls out. I have already done so. Thanks!