Having a high water temperature is detrimental to your vehicle. Ensure you keep tabs on your temps with one of the most trusted water temperature gauges on the market. SPECIFICATIONS-Traditional Incandescent Lighting Illuminates Around the Perimeter of the Dial-Autometer has Proven Track Record in Delivering Quick & Accurate Readings-12 & 16 Volt Compatible, Compatible with Nearly Every Street & Race Car Electrical System-Gauge Kit Includes 1/8" NPT Pressure Sender, 3/8" & 1/2" NPT Adapters, Bulb & Socket Assemblies, Red & Green Bulb Covers, Mounting Hardware & Detailed Installation Instructions-Light Covers: Red 3214 & Green 3215-Sending Units: 2258-Mounting Hardware: 2230-Bulb & Socket: 3220-Size: 2-1/16" (52.4mm)-Type: Air-Core-Range: 100-250 F-Lighting: Incandescent