Prosport 60mm Premium EVO Wideband Digital Air Fuel Ratio kit Utilizing the latest Bosch wideband O2 sensor -5 wire heated LSU4.9 our gauge now has the widest range 10.01 to 20.01 AFR readings on the planet. Featuring four color choices in one gauge (Red/Blue/Green/White) with a huge 60mm digital 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 four color 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 Daisy chain 0-5 volt output signal for data logging