Auto Meter 4369 Ultra-Lite Electric Water Temperature Gauge Traditional incandescent lighting illuminates around the perimeter of the dial Includes data acquisition grade temperature sender, providing unmatched accuracy and durability even in the harshest environments Auto Meters race proven digital stepper motor electric instruments provide unmatched accuracy while keeping hazardous fluids outside of the vehicle The accuracy of digital stepper motor gauges is further increased by utilizing a self calibration sequence during power up Gauge kit includes 1/8 NPT temperature sender, 3/8 and 1/2" NPT adapters, wiring harness, bulb and socket assembly, red and green bulb covers, mounting hardware, and detailed instructions for installation