I have a 1.5 gallon tank with a 275C. The pressure switch cuts off the compressor at 120 psi. Can I raise the pressure to 150 psi by changing the safety valve to 165 psi and the pressure switch to 150 psi? I know the compressor is rated at 150 psi max, do you think this would cause a problem?
as long as your compressor is rated for 150 psi and your tank is also rated at 150, then you will be fine.
what silvy said, running everything at its rated pressure should be fine. The safety valve is there in case something goes wrong.