2-5/8in. WATER TEMPERATURE; 100-250 ° F; CARBON FIBERA high water temp can be detrimental to an engine. Heat is the enemy of performance and reliability. Keep tabs on your temps with the most trusted water temperature gauge on the market. AutoMeter's advanced 1/8 NPT temperature transducer is included for a simple installation on any application. Simple Three Wire Installation Incl. Mounting Hardware/Installation Instructions Air-Core Electric Instrument Provide Quick And Accurate Readings Works Where Copper/Stainless Steel Tubing Will Not Ultimate High Performance Dial Face Look Precision Movement And Extreme Accuracy 1 Year Limited Warranty Traditional Incandescent Lighting Illuminates Perimeter Of Dial 12 And 16 Volt Compatible Incl. 1/8 in. NPT Temper Sender Incl. 3/8 And 1/2 in. NPT Adapters Incl. Bulb Socket Assembly Red/Green Bulb Covers