I would test your gauge to see how accurate it is. I would also bench test your wastegate to see when it is opening. When bench testing your wastegate don't put more than @ 20 lbs into it cause that might damage the diaphram.
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Dean
911 SC turbo, 3.0L 930 motor, G50, 930 brakes, DTA EFI, 352 RWHP DynoDynamic dyno,
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