Sierra Sterling 12V Dc Voltmeter 63478P2 in. gauge displays engine alternator output in volts. Sterling 12V DC Voltmeter 2 in. diameter 8-18 volt range Ideal for outboards and stern drives Sterling series Brushed aluminum dial Black graduations/numerals Black pointer Scratch resistant curved glass lens Polished stainless steel, near-flush bezels Perimeter lighting US and metric scales