Ombialo 30-4110 UEGO Air Fuel Ratio Gauge 52mm with 4.9 LSU Sensor, wideband Sensor WideBand A/F Ratio UEGO O2 Controller Gauge Kit The Wideband O2 air/fuel ratio UEGO gauge is a must if you want to maximize your engine's power and safety When tuning an engine, accurate air/fuel ratio data is critical because running with too rich of an AFR can cause a loss of power, and running a lean AFR can result in serious engine damag Feature: 1. All products in our factory are made of high-quality materials. Every product meets specifications before leaving the factory 2. Our WIDEBAND AIR/FUEL CONTROLLER with excellent product value, has passed the quality inspection, meet or exceed OEM requirements, and is durable 3. Accurate AFR data is critical when tuning an engine. Using a wideband air/fuel controller during the tuning process allows you to monitor AFR and adjust tuning parameters to optimize them for maximum power and efficiency Afr Value Range By Fuel Types: Gauge Display/0-5V Output Gasoline values from 10 to 20:1 AFR 0-5V Output E85 values from 6.6 to 13.2:1 AFR 0-5V Output Ethanol values from 6.14 to 12.3:1 AFR 0-5V Output Methanol values from 4.4 to 8.8: AFR Gauge Display/0-5V Output Lambda values from 0.68 to 1.36 Package Includes: 1 x UEGO Gauge Assembly 1 x UEGO Sensor 1 x O2 Sensor Bung 4 x Butt Connectors 1 x Installation Instruction 1 x 4 Lead Harness 1 x UEGO Sensor Harness 1 x Silver Bezel 1 x Black Lambda Faceplate 1 x White AFR Faceplate