The Bosch SP0F000051 is a Style Line 2" Electrical Voltmeter Gauge. It features a range of 8 to 18 volts with a 60 degree sweep. Requires hook up wire. The gauge is a standard 2" black dial for a 2-1/16" opening and features a chrome bezel with removable chrome mounting panel. Includes mounting hardware and 12 volt internal back lighting. Only for 12 volt negative ground systems. The Style Line features a clean easy to read look with a bright pointer against a white or black background. Bosch is known for precision, engineering, and innovation. Add style and you have the first-ever line of Bosch gauges, including replacement tachometers, speedometers, temperature and pressure gauges for all applications. Bosch Branded Gauges represent the latest in design following our 100+ year history of Automotive, Industrial, and Racing products.