Auto Meter 6145 Cobalt Full Sweep Electric Pyrometer Gauge Modern blue LED through-the-dial lighting provides clear visibility during nighttime use 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, thermocouple mounting kit, mounting hardware, and detailed instructions for installation 12 and 16 volt compatible, compatible with nearly every street car or race car electrical system