Did you mount the gauge to the fuel rail test port?
I have the same setup, although I'm switching to Vaporworx this week. My gauge, mounted to the test port, shows pressure after the car is turned off. It slowly bleeds off but its not instantaneous. Did you check all connections for fuel leaks?
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1967 Camaro - Project "Resale Red" - Sold to 175RGR 
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