The AEM Electronics Digital Wideband UEGO AFR Controller Gauge - Without Sensor is a powerful, cost-effective tuning tool that quickly and accurately monitors the Air/Fuel Ratio (AFR) of your engine, in an all-in-one wideband UEGO AFR controller and gauge.Controller gauge and hardware sold without wideband sensorWeld-in bung includedNo free air sensor calibration is required with approved sensors52mm (2-1/16") gauge housing0-5v analogue output (10-20 AFR range only)RS232 Serial OutputAccurate AFR data is critical when tuning an engine. Running rich (very low air/fuel ratio, excessive fuel) can cause a loss in power, while running too lean (very high air/fuel ratio, not enough fuel) may result in serious engine damage. Using a wideband air/fuel controller during the tuning process allows you to monitor AFR and adjust tuning parameters to optimize them for maximum power and efficiency.AEM's renowned Digital Wideband O2 AFR UEGO Gauge combines accuracy, speed and control with an easy to r