Auto Meter 3683 Sport-Comp II 2-1/16" 8-18V Full Sweep Electric Voltmeter Gauge Modern white LED through-the-dial lighting provides clear visibility during nighttime use Gauge kit includes wiring harness, mounting hardware, and detailed instructions for installation 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 Acquire data for later review with one-touch Peak Recall functionality Set a custom alert specific to your vehicle & receive warning notification to highlight the need for driver attention