A new Evolution in digital gauges Introducing the 4 time award wining, (SEMA show 2010) industry first, dual color digital gauge. This gauge has a Black bezel, Black case and is Blacked out when off. This one gauge can display either Red or Blue and is dimmable ! A 270° dial sweep provides quick one glance accuracy. Track tested and race proven these gauges use precision electric senders (Included) to keep hazardous fluids out of the passenger compartment. All of our Evo Series gauges perform a dramatic opening ceremony with a full digital sweep each time the vehicle is turned on. These gauges are very thin, perfect for tight mounting options Only 1.5" deep including the studs EVO Series Wideband Air Fuel Ratio Gauge 52mm (2 1/16") This one gauge will display Red or Blue and is dimmable! Includes 0-5 volt output signal for data-logging Utilizing the latest Bosch wideband O2 sensor -5 wire heated LSU 4.9 (Prosport Inc. is the only one in the USA to use them) our gauge now has the widest range 10.0:1 to 20.0:1 AFR readings on the planet. Featuring a Dual color (Red or Blue) readout in the center of the gauge and a bar-graph syle LEDs around the outside of the gauge for immediate reference to AFR. This is a complete kit that includes everything you need: AFR digital Gauge Bosch 4.9 5 wire heated O2 sensor 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