Originally Posted by motorhead
Just a shot in the dark here, but have you tested the boost guage itself? Have you put a mechanical guage on the plenum to see what the pressure is when accelerating?
Motorhead, that'* a great idea, but in our rather extensive experience on this Forum, we have yet to see a single failure of a boost gauge. To take it even farther, we've yet to see a single failure of a MAP sensor on the Series 1 (which sole purpose is for a boost pressure indication).
Let'* stick to what we know are the most common failure modes.