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If it makes hesitation sounds just before shutting off, you need to oil the compressor as per the manual. This is the most common problem.
If it is kicking on and off normally, you need to adjust the pressure relay. The instructions are under the cover.
The problem with compressors not building pressure is usually a bad pressure switch or bad regulator. Does the motor shut off at 20psi or does it continue running and not build pressure? If the motor continues to run with no increase in pressure, the you should go over the machine looking for air leaks from your regulator back all the way to the motor. Any air leak while the compressor is running can cause the pressure to "peak" way before the intended shutoff that it is regulated to.
Check for a leak between you compressor head (pump) and your tank. Your pump output may be good but as your tank pressure gets higher the leak will not allow the tank to build up.
I would say that the gauge needs to be replaced. These are common items so go to any auto parts or craftsman hardware store and purchase a replacement.
be sure to use some joint compound or teflon tape on the threads so u dont have any leaks.
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