... heating, air conditioning, hydraulic, water tanks, OEM. Utility Gauge Specifications Dial1.5"(40mm),2"(50mm),2.5"(63mm),4"(100mm) CaseBlack Plated Steel / Plastic LensGlass ... St/St, 1/2" or 1/4" NPT Range30"Hg.Vac./kpa -- 0-5000 Psi/Kpa Accuracy±3-2-3% 2.5"(63mm) Utility Gauge