Auto Meter 3837 GS 2-1/16" 100- 250 F Short Sweep Electric Water Temperature Gauge Modern green LED through-the-dial lighting provides clear visibility during nighttime use 12 and 16 volt compatible, well-suited with nearly every street car or race car electrical system Gauge kit includes 1/8 NPT temperature sender, 3/8 and 1/2" NPT adapters, mounting hardware, and detailed instructions for installation Auto Meters race proven air-core electric instruments provide quick and accurate readings while keeping hazardous fluids outside of the vehicle