Designed For The Absolute Harshest Environments The Autometer Extreme Environment Series Gauges Provide The Very Best In Waterproof Sealing. One Of The Single Most Important Factors In Determining How Your Engine Performs (And How Long It Performs Between Rebuilds) Is Proper Oil Temperature During Operation. Knowing Your Exact Temp Allows You To Make Sure Youve Got The Proper Oil Weight And Cooling Capacity. Using Autometers Advanced 1/8" Npt Two Wire Temperature Transducer You Can Be Assured Of The Most Accurate Possible Readings Of The Life Blood Of Your Engine. The Advanced Digital Stepper Motor Drive Keeps Needle Movement Smooth And Precise. 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. A Direct Plug In Wiring Harness Is Included For Ease Of Installation.