Afternoon lads. Finally got my stack boost gauge fitted after 2 days of totaly **** british weather. The only problem is the gauge is either faulty or my car is. The gauge itself is a second hand stack boost gauge with a psi display, i bougth it off a member on here, he had already taken it apart and put a red film other the back to match the s3 clocks. The thing is ive taken the car out for a test drive and its only showing the car boosting to 4psi, on idle its showing as 22hg or whatever it is that vacuum is! So is this right? The car's a 2000 s3, it is modified but not remapped, its also just had a brand new maf fitted. One last thing to add, when the cars turned off the gauge is showing 2hg thingy, is this right or should it be at 0?