Autometer American Muscle 52mm Full Sweep Electric 12hr Analog Clock GaugeA Stylish Way To Match The Rest Of The Gauges In Your Interior And Still Keep Track Of Time, Autometers Quartz Movement Electronic Clock Is Designed For Long Life And Ultra Low Power Consumption. Make A Statement With Your Interior With This High Performance Timepiece. Installation Instructions 12 and 16 volt compatible, compatible with nearly every street car or race car electrical system Gauge kit includes mounting hardware and detailed instructions