I have a GTR 33 running 10psi not the stock 7psi and my standard boost gauge is just under 1/4. This is normal when the boost is turned up the gauge callabration and sensor's from the ECU say it's more than 0psi at idle, so the gauge is reporting correctly so to speak. It is really nothing to be concerned with. If anyone knows how to recalbrate the gauge or sensors please follow on from here.....