Pressure switch cuts in too soon

steter

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I recently installed a new 30/50 pressure switch. It worked fine for a couple months, but now it will cut in at about 37 psi and off at 50. With the tank drained, the air pressure is 28 psi. Any ideas on what is causing this?
 
If it's a new switch, and the pipe to the switch was clean, it must either be:

1. A bad switch
2. A bad guage

Rancher
 
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