From High Banked Ovals To Saturday Night 1/4 Miles To High-Performance Boats, Knowing That Youve Got Proper Cooling System Pressure Is Critical In Any Application. Autometers Mechanical Water Pressure Gauge Utilizes The Most Precise Bourdon Tube Meter Movement On The Market To Deliver Accuracy And Durability You Wont Find Anywhere Else. An 1/8" Npt Connection On The Back Makes For Easy Installation And Nylon Lines And Fittings Are Available Separately.