VDO battery voltage indicator Parameters: Diameter: 52mm (2 ") Voltage range: 8 to 16V DC Operating voltage: 12VVDO battery voltage gauge Parameters: Diameter: 52mm (2") Voltage range: 8 to 16V DC Operating voltage: 12V VDO battery voltage indicator Parameters : Diameter: 52mm (2 ") Voltage range: 8 to 16V DC Operating voltage: 12V