Advanced Engine Management (AEM) 30-4900 | Air/Fuel Ratio Gauge

AEM Failsafe AFR gauge


The Wideband FAILSAFE Gauge provides the ability to accurately tune AFR, while actively protecting your engine by constantly monitoring AFR curves and activating a user-defined failsafe strategy if it runs lean. The Wideband FAILSAFE Gauge is a Universal Exhaust Gas Oxygen (UEGO—“you-way-go”) controller with an internal boost sensor, an internal data logger and a full color Organic Light Emitting Diode (OLED) display. It includes technology to activate a failsafe strategy in the event AFR falls outside of a user-defined operating window. If the AFR falls outside of the set operating window, the Wideband FAILSAFE Gauge triggers a user defined output function that can save an engine from catastrophic damage.


  • JBtuned

    Posted by JBtuned | 5 years, 1 month ago

    We love this gauge and use it with alot of customers cars. This provides a great tuning solution and comes with features that are worth 4 times the price. Constant 2 hour data logging of multiple sensors, You can monitor a ton of information with this gauge once it is hooked up to a laptop. Also it is a wideband and a boost gauge all in one. Comes with lots of faceplates and is fully configurable to your preferences. Additionally it comes with many failsafes (hence the name) and can shut of car off in the case of a boost spike or lean condition. The only downfall is if your planning to run more than 30psi of boost as the gauge stops at 30. Amazing equipment for very little expense. We offer them here

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