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  1. Update: Replaced the MAP sensor and all is good. Now both gauges are just a few pounds different. The truck never threw a code on this one. Oh well... Everyone, thanks for your help.
  2. Thanks for the links. That gives me some insight to what might be happening. What has me stumped is the spread between the two gauges.. Thanks Michael. No codes and the truck running good has me wondering.
  3. My Stewart Warner pillar gauge and I-Quad aren't reading boost the same. When I'm on the throttle, the pillar gauge says 35+ and Quad says 5-6. At cruise, mech says 4-5, Quad says 0 No doubt the mechanical gauge is right and Quad is wrong. I hardly use the Quad gauge on my phone so I don't know how long there's been a difference. No codes. Map sensor is clean - no soot. Is the Quad reading directly from the MAP sensor or thru the ECM? Can a MAP sensor be sick and not throw a code?
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