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I dont know if the new tune is making the scan gauge II act up, or if I have a sensor going.
Before tune, BST reading worked fine, followed the dash somewhat.
After tune, at idle BST is -.3 and when hammered, never goes over 13. Well, it does, but it goes to a negative number, then goes back to a "normal" number.
Do I need to change the Scan Gauge II to the other BST pid, or do I have a bad sensor?
Take the tune back to stock and see if it acts "normal". Tuners sometimes manipulate the MAP/Boost parameters to get more boost because the PCM limits that.