Koso Voltmeter Gauge For Harley Touring Koso has over 30 years of experience in designing and manufacturing high quality products. They are known for their product's quality, reliability and capability. Never be surprised by a dead battery again with this voltmeter gauge. Features Plug and play Provides the battery voltage from 8 to 16 volts DC Equipped with a 2 color changeable LCD display of red or blue Easy to connect and to install