I have 10 GAL AIR COMPRESSOR, the gauge is redlined at 125psi, the most it puts out until it is cut off by the pressure switch is 105 psi. How can I boost that by 10-15 PSI????? My impact gun has a label that says to use at least 115psi and at 105psi it does not bust lug nuts loose.

Look for the electric box probably with a cover on it. It may have instructions on how to adjust it under the cover. There should be a screw/nut for pressure to cut ON and when to cut OFF - you may need to turn a little at a time and waste the air to see where you end up.

Note: This no doubt has a "blowout" valve that will just release pressure at a certain pressure. Some are close to the 100psi you have and going higher will mean another safety blow out thingy (nice word)

T
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Tom Greenleaf - MetroWest, Boston

LOL. Pressure release valve? Thingy is a good word, though.
Loren
SW WA