The low-pressure gauge will read between 30 psi and 35 psi on an older system using R-12 refrigerant (freon) and between 35 psi and 40 psi on a newer system using R-134a refrigerant. The high-pressure gauge will read between 150 psi and 250 psi on the R-12 systems, or between 250 psi and 350 psi on the R-134a systems.
On hot day @ 85=+ degrees it should be between 45 to 50 pounds on the low side pressure port
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