200 PSI Locomotive Pressure Gauge, this gauge measures 2" in diameter, has brass face and bezel in a steel case. This is the same as my bottom mounting pressure gauge, but this has a 1/8"MNPT thread at the back of the gauge making it ideal for installations where the gauge can be mounted on panel at the top of the back head. This gauge makes a beautiful addition to any live steam locomotive cab. I also have bottom mount available see separate listing for those gauges.