Enjuku Racing has Created a Package Deal Including the new AEM Part # 30-4110NS and also a Bosch 4.2 LSU Sensor. 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. 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. AEMs legendary Digital Wideband O2 AFR UEGO Gauge is a wideband UEGO air/fuel ratio controller (AFR) and gauge in one. It unites accuracy, speed and control with an easy to read, digital LED display and sweeping LED "needle" that changes colors as AFR changes from rich to lean. NOTE: The 30-4100 Wideband UEGO Gauge Controller that uses the Bosch 4.2 LSU sensor has been superseded to the 30-4110 Wideband UEGO Gauge Controller that uses the Bosch 4.9 LSU sensor. The 30-4110 Wideband Controller Gauge is cosmetically identical to the 30-4100. Instructions for the 30-4100 are still available in the Instructions tab. CAN I CHANGE THE AEM UEGO SENSORS CONNECTOR? No. There is a laser-etched, calibrated resistor in the sensors connector body. This resistor is specifically created for the exact sensor that it is attached to. Modifying this will invalidate the sensors output.