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.
In my opnion the AEM UEGO 30-4100 is the best and cheapest wideband sensor controller on the market. It allows for fine tunning of all fuel settings and really give the tuner amazing control over the vehicle. The Bosch sensor the 30-4100 comes with is what really makes this wideband controller incredible as it allows for precise measurement.