I've tested the regulator on my compressor with bike tires. The tires
on the bikes in the garage range from 40 PSI to 120 PSI. I set the
reg to the desired pressure, pump up a bike tire, then measure the
bike tire with a tire gauge. At least lets me kow if the regulator
matches the tire gauge. Although I don't know for a fact if either
one is actually accurate or not.
Without a guage, how are you going to tell when it's right?
If the regulator is just tightened a little, the air pressure should be low. Use
your air nozzle - it should have a weak jet of air. Turn it up, it should have
a strong jet of air. Open hose settings are meaningless. If you are going from
high to low settings, the hose pressure may stay high until you've let out some
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