Auto Meter 1282 American Muscle 2-1/16" 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 12 and 16 volt compatible, compatible with nearly every street car or race car electrical system