My estimate is that the general consensus would agree on 30 PSI... at least I would :-) --Scott Munger '93 S4 > > Anyone have any thoughts on overdriving the VDO Vision 150 > 121 to 30psig? > I'm still working, albeit slowly, on a new face for the 150 > 121 gauge, and > wonder if I should mark the boost side up to 30psig?