PSI gauge

Hi, welcome to TFP! The pressure gauge is easy to replace. You can get a replacement gauge at most hardware stores for less than $20. The gauge will unscrew from the filter and you can take it with you to be sure to get the correct size.
 
That is true if you have a two speed or variable speed pump and run it on low speeds the gauge may not show an increase in pressure. If that is the case set the pump to a higher speed and see if the gauge moves.
 
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