Auto Meter 3544 Sport-Comp Electric Pyrometer Gauge Kit Traditional incandescent lighting illuminates around the perimeter of the dial The included Type K thermocouple assures maximum accuracy and minimum response time Auto Meters race proven digital stepper motor electric instruments provide unmatched accuracy which is further increased by utilizing a self calibration sequence during power up Gauge kit includes Type-K Thermocouple, wiring harness, various methods for thermocouple installation, bulb and socket assembly, red and green bulb covers, mounting hardware, and detailed instructions for installation 12 and 16 volt compatible, compatible with nearly every street car or race car electrical system