Why not "calibrate" the pump gauge using your gauge. You know 40 is 45 already. Once you know what to make the gauge read to agree with your tire gauge, you are golden. You probably cannot adjust the reading of the on pump gauge, but you can figure out the deviation at your desired tire pressure.
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Originally Posted by
colorider
Phobias are for irrational fears. Fear of junk ripping badgers is perfectly rational. Those things are nasty.