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Quadzilla adrenaline install with fuel pressure sensor

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I installed an adrenaline on Friday and because I have an airdog 2 165 I got my a 1/2" fuel tee with the port. Today I installed the fuel tee then the needle valve into it, then I installed the fuel pressure sender. The needle valve was completely closed, I started the truck and the quad app immediately said 53psi under fuel pressure. I turned off the truck, checked my connection and the needle valve to ensure it was closed. Started the truck again the fuel pressure now reads 48psi, so I adjusted the fuel pressure on the airdog. At that point the gauge continued to read 48psi, so I turned off the truck and restarted it and the gauge started to read 33psi. Finally I adjusted the airdog almost all the way down and the pressure remained at 33psi. This all took place with the truck at idle and the needle valve closed or not even a quarter turn open. Any ideas what is causing the issue?

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