Kuryakyn, LED battery gauge. Black

Offers real time info on the charging status of your bike. An arry of L.E.D.''s indicate the operating voltage of the bikes electrical system. Green L.E.D.''s between 12.5 and 14.5 V. Amber is no charge and if voltage drops below 10V or above 15V a red L.E.D. will flash to alert the rider of an inpending stall and to prevent damage to the battery or sensitive electronic components on the motorcycle. Simple 2-wire connection. Daylight sensor automatically adjusts brightness of the L.E.D.''s. Compact size of about 2" (50mm) wide x 3/4" (19mm) high x 3/16" (5mm) thick.