Autometer 2 1 16in 140 280 Degree F Mechanical Water Temp Sport Comp Gauge. Engines Dont Like High Water Temperatures, Heat Is The Enemy Of Performance And Reliability. Keep Tabs On Your Temps With The Most Accurate, Quickest Responding Water Temperature Gauge On The Market. Autometers Advanced Bourdon Tube Meter Movement Provides Unparalleled Performance In The Most Demanding Applications. A 6" Capillary Tube And 1 2" Npt Mounting Nut Are Included. Installation Instructions Gauge kit includes 1 2" NPT adapter, bulb and socket assembly, red and green bulb covers, mounting hardware, and detailed instructions for installation Autometers Race Proven Mechanical Instruments Provide Trusted Accuracy While Being Simple To Install No electrical system required for gauge operation compatible with every street or race vehicle Mechanical movements provide accuracy and durability even in the harshest environments