Are you sure there's not a leak in the pipe to the boost gauge?
I had a similar thing to this, had the intercooler off, checked everything etc etc.
Changed the boost gauge, then by chance checked the t-piece....had a tiny split, just enough to make the gauge under read.
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2001 Bugeye - Project Black/Red, 1997 JDM Type R, 1995 V1 WRX, Defender Tithonus MOD Styleeee!
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