IIRC the DIC boost gauge only shows BBV position. IE when the DIC shows you making full boost your BBV is fully open, regardless of PSI.
Are you sure about that? When I was making **** boost (4-5ish lbs) because of a vac leak the guage would only go about halfway. Had nothing to do with my BBV. I thought it went off PSI it just only went up to like 7 or 8.