AEM Analog Gauges feature a seven user-selectable back lighting to match most popular factory gauge clusters. Each gauge comes with interchangeable black & silver bezels and is available in black or white gauge face plates. A 0V to 5V differential analog output is built-in for data logging or closed-loop tuning. A smooth, accurate and quick needle action, built-in readiness light and internal diagnostic warning light are what separates AEM's Analog Gauges from the competition.