Lowe's, Home Depot, and I believe ACE all see water pressure gauges which you can screw on to a hose bib to read your normal house water pressure. Then you may need to borrow an air compressor and a tire gauge. You will find a shrader valve (looks like a tire valve) on the top of the new expansion tank. Connect the compressor tire fill adapter for a few seconds and the check the pressure in the tank until you get to your measured water pressure, then install.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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