APSX D2 Digital Wideband O2 Air Fuel Ratio Controller All-in-One 2 1/16" (52mm) Gauge - White Faceplate (White) Analog output for engine management systems (EMS) and data loggers (MegaSquirt) Digital output is 9600 8N1 serial that can be connected to your PC Simulated NB output Configurable settings such as fuel type, lower/upper limits, calibration