gravity5
+1y
First you can use either a York style or a sanden style....but either way it has to be r-12, and oil bath type. As for the pressure switch yes, you just use it to activate the clutch on the AC pump. as for modifiing it to be and Air compressor, on the yorks you have to block off an oil passage, and on the sandens they basically work as is, but I took mine apart, and tapped the o ring fittings to 3/8 npt. And a few secret internal mods to increase the airflow and reliability of it.