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Calibrating the pressure switch is possible. There is a setscrew on the side which is allen head, the manufacturer has originally set them and put silicone around the threads where the plastic meets metal base. That is what the set screw is for. Take a utility knife score the silicone and peal it out. Loosen setscrew pressurize system, adjust pressure switch by threading the top and bottom half in or out (A little adjustment goes a long way). Adjust to the proper cut in/out pressure, tighten setscrew, reverify pressures, re-silicone – done.