30-4400 AEM 52mm Voltmeter Digital Gauge OVERVIEW The AEM Digital Voltmeter Gauge combines unsurpassed accuracy, speed and control with an easy-to-read digital LED interface that displays voltage in 1 volt increments, and a sweeping LED "needle" that lines the edge and moves as voltage changes from 8 to 18v. The digital voltmeter gauge's digital readout will automatically increase and decrease in intensity due to the built in ambient light sensing photocell. Each gauge includes interchangeable silver and black bezels and black and white faceplates to personalize the look of your gauge. Features: Gauge Readout from 8 to 18V Ideal for carbureted or EFI vehicles Easy-to-install Plug & Play harness and sensor included 24 green LED display lights provide immediate reference to monitored engine function Three digit readout in center Digit digital readout displays precise voltage Auto-dimming gauge face and read out lighting Standard 52mm (2-1/16") gauge housing