AEM Digital Gauge Kit: Voltmeter (52mm), 30-4400AEMs digital Voltmeter display gauge delivers unsurpassed accuracy and visibility. Each gauge includes 24 color coded (Red, Green, Yellow) LED lights that change from green to yellow to red for immediate reference to the measured parameter, and an integrated thee digit display that reveals real time operating conditions. AEMs digital display gauges feature a standard 52mm gauge housing that fits in most gauge pods and can be remotely mounted virtually