The Innovate Motorsports DB gauges are 52mm (2 1/16?) air fuel gauges. Each gauge features a bright LED display (available in blue, green, or red). Each Gauge Kit includes the gauge, an LC-2 wideband controller, oxygen sensor, bung, serial cable, and the award-winning LogWorks engine-tuning software. For tuners seeking the most cost-effective way to start monitoring Air/Fuel Ratio, the DB series gauges offer an attractive option, while opening the world of true digital data acquisition and software engine analysis. For example, users can add multi-sensor interfaces, and log 5 critical parameters directly into any PC or laptop. Or they can get a PL-1 data logger for hundreds of hours of 32-channel data logging on an SD card. Best of all, the DB gauges include the powerful LogWorks software for synchronous high-speed logging of wideband data, other MTS sensors, and data from a growing list of ?piggyback? fuel controllers and standalone or factory (OBD2) ECUs. This is the same software used by champion engine builders and racers. Patented DirectDigital Wideband Technology Ability to calibrate O sensor for maximum accuracy Two configurable linear 05v analog outputs Complete kit with weld on bung, programing cable, sensor cable, and manual