K4591 Differential Pressure Gauge Scale Type PSID Pressure Range Minor Div. .5 lb Rated Total Pressure 4000 PSI Relay Type SPDT Full Scale Accuracy ( Percent) 3/2/3 Percent Connection Size NPT (In.) 1/4 FNPT Amps AC 0.25 Dial Size (In.) 4-1/2 Ambient Operating Range (F) -40 to 200 Degrees F Includes Installation and Operation Manual Manufacturers Warranty Length 5 Year