Hi mate to adjust the pressure you need to take the cover off the pressure switch by unscrewing a little screw in the middle then it will pull off then inside you will find a screw /a bolt with sighns next to it saying + and - unscrew to decrease pressure screw in to increase pressure the pressure guage just tells you how much air is in the tank and when the compressor turns off it will bleed the air off in the system just incase you didnt know
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