The AEM Electronics world famous wideband O2 air/fuel ratio UEGO gauge features a digital LED display and a sweeping LED needle that changes colour as the air/fuel ratio goes from rich to lean, the gauge has a 52mm housing which ensures that it can fit in to most gauge pods and can be mounted virtually anywhere in the vehicle.The gauge features a 0-5v analog output which can be used with data loggers and most engine management systems. Each gauge is supplied with a black and silver bezel along with a black only faceplate for lambda and a white and black faceplate for air/fuel.The wideband gauge uses a Bosch 4.9 LSU UEGO sensor that controls its speed and accuracy which in turn has a faster light off time and is able to draw less current. The sensor never requires free air calibration with the air/fuel gauge.The wideband gauge is a must have if you are tuning your vehicles engine and want to maximise power safely. This gauge will accurately tell you if the car is running to rich or lean