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The N55 does not generate vacuum in the charge pipes. Look up a technical article on it. If it did have vacuum it would only be in the intake manifold, after the throttle body. Just think about it, where would a normal vac source be for a boost gauge? On the intake mani, not the charge pipe. The P3 gauge gets the info from the TMAP sensor on the CP from the CAN connection. Can you find a pneumatic boost guage for the N55 to source pressure from the intake mani?
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