AEM has combined its single-channel wideband UEGO controller and gauge display into one unit, uniting unsurpassed AFR accuracy and control with an easy-to-read interface. AEMs Gauge-Type Wideband UEGO Controller features a digital LED display and sweeping LED needle that changes colors as AFR changes from rich to lean. The units 52mm (2-1/16) gauge housing fits in most gauge pods and can be remotely mounted virtually anywhere. No laptop required for monitoring! Bosch sensor included Accurate to 0.1 AFR