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Thanks for the help. I got a 0-200 gauge at Lowes and put it in the air tank. The bed is at the sandblaster so everything is easy to get to...I found I'm building to 140 psi then the valve opens and it bleeds down to 120 before closing. Definately not good. When I first got this in February...

My pressure relief valve on the air tanks has started to pop open every 10 seconds or so. My gauge shows 100 psi and doesn't drop for the second or two the valve is open. The needle is to the right of the 90 line about an 1/8" of an inch. Is that pegged for the gauge where I might actually...