I Have two gauges on the PT, one Mecanical and one digital. both of them read exacly the same thing. I have never gotten the "check engine" light on or the Famous code. Not with the Hallman nor with the A'PEXi. I had the hallman connected to the #2 solenoid and the A'PEXi completly bypasing the factory system. I "T" from the forward turbo fitting and to the Wastegate using less than two feet of 1/4' id line
Ian
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