Air Compressor Pressure/Hydraulic Gauge 2.5" Face Back Mount 1/4" NPT 0-200 PSI 0-200 PSI back mount air compressor pressure gauge. This gauge features a 2.5" face and has 1/4" NPT thread on the back center of the gauge. Air Compressor Pressure/Hydraulic Gauge 2.5" Face Back Mount 1/4" NPT 0-200 PSI -1/4" Male NPT Pipe Threads  -Center / Back Mount  -0-200 PSI Gauge reads at 0, 50, 100, 150, 200 PSI  -2.5" Face