2-1/16 C/F Air/Fuel Ratio Gauge Wideband

The AutoMeter 2-1/16 Carbon Fiber Air/Fuel Ratio Gauge Wideband (model 4778) is a precision engine diagnostic instrument designed for tuners, performance builders, and engine management specialists who require real-time air-fuel ratio monitoring. This electric wideband gauge reads across a 6:1–20:1 AFR range with digital display accuracy, making it essential for carburetor and fuel-injection tuning, emissions optimization, and engine diagnostics during dyno sessions or field testing.

The 2-1/16-inch diameter gauge face features a carbon fiber look design that integrates seamlessly into modern dashboard clusters while maintaining visibility under high-vibration or high-heat engine bay conditions. The wideband sensing capability—spanning from rich (6:1) to lean (20:1) ratios—provides the granular feedback necessary for precision tuning work that narrowband sensors cannot achieve. The electric digital readout eliminates ambiguity and allows for consistent, repeatable measurements across multiple tuning iterations.

This gauge is suited for automotive enthusiasts, professional engine builders, and shop technicians performing fuel system optimization. It addresses the core need to verify that an engine is running at the target air-fuel ratio—critical whether you're maximizing power output, improving fuel economy, meeting emissions standards, or troubleshooting lean or rich-running conditions. The compact 5.5 x 5.2 x 5.6-inch form factor allows flexible dashboard or pod mounting in street machines, track vehicles, or shop test stands.

AutoMeter wideband gauges are recognized in the performance tuning community for repeatable accuracy and durability across diverse engine types and fueling strategies. The 6:1–20:1 range accommodates everything from nitrous oxide boosted engines (running richer) to naturally aspirated, lean-cruising builds, making this a versatile choice for multi-car shops or builders who work across different engine platforms and tuning methodologies.