Pressure Aircon

Hello .

does anyone know the pressure of high pressure and low pressure of the air conditioning system
R12 / R290 / R600
on the 1990 XJ40 with only one pressure switch for the low pressure


The SANDEN compressors have the low pressure switch on the rear cover.
Operating pressures are usually about 30 to 40 PSI on the low and 180 to 300 PSI on the high. (sitting in traffic on a hot Texas Summer day can get the high side up pretty HIGH)