Aluminum bezel with white colored face and black/silver numbersMeasures pressure in PSI or bar and vacuum pressure in inches of MercuryMandatory when boost pressure is modified to higher than OEM standardRear twist-on ring mount designWhite colored face with numbers in black and silverThis boost/vacuum gauge is engineered to provide accurate readings under harsh conditions and is mandatory when boost pressure is being modified to levels higher than OEM standard on a production turbocharged car. This gauge will measure pressure in either PSI or bar and can also measure manifold vacuum pressure in inches of Mercury. A rear twist-on ring mount design makes mounting simple.