Designed For The Absolute Harshest Environments, The Autometer Extreme Environment Series Gauges Provide The Very Best In Waterproof Sealing. Seeing The Exact Water Pressure On Your Vehicle Can Mean The Difference Between Extracting The Most Performance Safely And Expensive Failures. Autometers Digital Stepper Motor Water Pressure Gauge Will Precisely Measure Your Engine Coolant Pressure At Levels Of Accuracy Previously Unheard Of Even In Professional Gauges. Our Advanced 1/8" Npt Solid State Pressure Transducer Provides The Best Possible Measurements On The Market With Unparalleled Resistance To Vibration And Heat. Preconfigured Warning Points Change The Gauges Led Illumination From White To Red, Allowing You To Concentrate On The Work At Hand Or Taking The Checkered Flag. Dont Take Chances With Your Investment; A Precise Water Pressure Gauge Could Be The Cheapest Insurance Youve Ever Bought.