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AEM's legendary Wideband O2 Air/Fuel UEGO Gauge unites unsurpassed accuracy, speed and control with an easy to read, digital interface. This gauge-type controller features a digital LED display and sweeping LED "needle" that changes colors as AFR changes from rich to lean. The unit's 52mm (2-1/16") gauge housing fits in most gauge pods and can. Re: AEM UEGO 30-4110 Install Post by skaterguy1986 » Fri Feb 07, 2020 2:46 am Should have a near zero voltage offset, if you have more than 0.02 then the ground isn't good. AEM's World-famous Wideband O2 Air/Fuel UEGO (Universal Exhaust Gas Oxygen, "you-way-go") Gauge is a must for anyone looking to maximize engine power and safety. When tuning an engine, accurate air/fuel ratio data is critical. Running rich can cause a loss in power, while running too lean may result in serious engine damage.