Air Compressor Pressure/Hydraulic Gauge 1.5" Face Back Mount 1/8" NPT 0-160 PSI 0-160 PSI back mount air compressor pressure gauge. This gauge features a 1.5" face and has 1/8" Male NPT thread on the back center of the gauge. ir Compressor Pressure/Hydraulic Gauge 1.5" Face Back Mount 1/8" NPT 0-160 PSI -1/8" Male NPT Pipe Threads  -Center / Back Mount  -0-160 PSI -Gauge reads at 0, 20, 40, 60, 80, 100, 120, 140, 160 PSI  -1.5" Face