2-5/8 U/L Wideband Air/ Fuel Gauge

The AutoMeter 2-5/8 inch Ultra-Lite Wideband Air/Fuel Gauge (model 4479) is an essential tuning instrument for serious engine builders, performance shops, and street enthusiasts who demand precision fuel mixture feedback. This compact yet readable gauge delivers real-time air-fuel ratio data, allowing you to optimize carburetor jetting, fuel injector maps, and ignition timing with confidence. Whether you're tuning a naturally aspirated engine, forced induction build, or racing platform, a wideband O2-based gauge eliminates guesswork and prevents lean-condition damage that can destroy pistons, rings, and valves in seconds.

The 2-5/8 inch diameter Ultra-Lite housing fits seamlessly into tight dashboard clusters and custom gauge pods without consuming excessive real estate. AutoMeter's wideband technology continuously monitors exhaust oxygen content and translates it into a precise air-fuel ratio reading across a wide operating range—critical for engines running rich (high fuel volume during acceleration) or lean (peak efficiency cruise). The gauge's analog needle movement provides instant visual feedback that digital displays cannot replicate, letting you spot transient mixture changes during gear transitions or load swings.

Durable construction and automotive-grade electronics ensure reliability under vibration, heat, and electrical noise typical of high-performance engine bays. This gauge benefits drag racers fine-tuning fuel pressure curves, street rod builders dialing in carburetor settings, and anyone needing accurate air-fuel ratio readings for performance tuning. Its compatibility with wideband O2 sensors makes it a versatile choice for various applications.