I have not replaced it but the pressure switches I find on Amazon say you need to calibrate the switch. Getting that wrong will be dangerous so I decided not to. If get it "too high" then the pressure will be too high and possibly dangerous if the safety valve fails for any reason (like being jammed with food). If "too low" then pressure (and therefore temperature) will be too low and food will not be cooked as much as you expect.
Strongly recommend not replacing this part unless you can get original, calibrated, from manufacturer.