AEM Wideband Air Fuel Ratio Gauges (UEGO - Universal Exhaust Gas Oxygen) are true Wideband O2 sensors that use BOSCH O2 sensors for the best quality and highest reliability when obtaining your air fuel ratio. It's critical to know your engines mixture when you have modified your engine. Even raising the boost 5psi can significantly impact your engines air/fuel ratio to the point of bringing on a lean condition that can result in detonation.
