Premium EVO Series Wideband Air Fuel Ratio Gauge 52mm (2 1/16") This one gauge will display Red, Blue, Green and White. 7 stages of dimming for both day and night veiwing Includes 0-5 volt output signal for data-logging Utilizing the latest Bosch wideband O2 sensor -5 wire heated LSU 4.9 our gauge now has the widest range 10.0:1 to 20.0:1 AFR readings on the planet. Featuring four color choices in one gauge (Red/Blue/Green/White) with a huge 52mm digital readout in the center of the gauge and a bar-graph syle LED's around the outside of the gauge for immediate reference to AFR. This is a complete kit that includes everything you need: AFR four color digital Gauge Bosch 4.9 5 wire heated O2 sensor UEGO Control box Mounting Cup Weld in Bung Instructions Wiring harness(Gauge to O2 sensor) 10 feet long Plug and play wiring harness Decals 0-5 volt output signal for data logging Free Tech support