A wideband UEGO sensor controller accurately monitors Air/Fuel ratios (AFR) during the tuning process to prevent a lean fuel mixture, which could lead to engine damage. 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. AEM’s 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 unit’s 52mm (2-1/16”) gauge housing fits in most gauge pods and can be remotely mounted virtually anywhere. Ideal AFR monitoring tool for EFI and carbureted applications, and engine dynamometers Does not oscillate AFR reading like narrow band sensors No laptop required for monitoring! Bosch sensor included Accurate to 0.1 AFR Reads in AFR or Lambda via a switch in back of gauge housing 24 Color-coded LED display lights provide immediate reference to engine’s air/fuel ratio (AFR) or Lambda ratio Integrated three-digit display reveals AFR or Lambda in real time User-programmable 0-5v analog output included for use with data loggers and virtually any engine management system Serial data stream included for output of AFR (RS 232)