It appears there are 3 wires from this switch, which is located on the high side of the system.
One wire goes to the condenser fan relay, more than likely turning it on/off.
One wire goes thru the low side pressure switch then to the panel control.
One wire goes to the computer.
My thought is the wire from the control panel starts the sequence, and is in series with the low and high pressure switches, to the cpu. Either switch can turn off the compressor by opening.
The high pressure switch might be 2 stage, first stage turns on condensor fans, second stage turns off the compressor. Or the switch is 1 stage, where the condensor fans operate anytime AC is on, and opens only under high pressure being above spec.
Dan & Sharon (Zena-Our Yorkie Puppy)(Kasey-Our Yorkie Puppy RIP 9Jan05-26Jul17) On the Road (2012 Journey 36M, 2020 Chevy Equinox)
USN-Ret ('65-'93) Fulltimers, Class of 2012