I have an autometer phantom boost gauge that I am hoping to run with my turbo. The gauge reads 7lbs of vaccum as it sits on the bench. Do I need a new gauge? Can it be reset to zero somehow?
It is just two vertical tubes connected with a U shaped tube at the bottom and filled with either water or mercury. In your case, use water. Make it 72" tall and hang it from the wall of your garage. Fill it 1/2 way up with water. Mount 2 yard sticks, one on top of the other right beside it. Put the 1" marks in the middle so that one reads 1-36" down from center, the other 1-36" up from center.