FHRHRY Wideband UEGO Air/Fuel Ratio Gauge 52mm with 4.9 LSU Sensor — Digital AFR, 0–5V Output

This compact 2-1/16" gauge assembly delivers real-time air/fuel ratio feedback for tuning and monitoring combustion. It combines a bright digital readout and an LED needle that changes color to indicate rich or lean conditions, while the included LSU 4.9 wideband sensor supplies fast, accurate oxygen readings without the need for free-air calibration. The kit's plug-and-play wiring and universal 52mm housing make it suitable for most instrument pods and aftermarket installations.

How accurate and responsive is the 4.9 LSU sensor for tuning?

The included 4.9 LSU sensor is designed for rapid, repeatable AFR measurements and quick response to changes in mixture. It reads fine increments of air/fuel ratio so you can make precise adjustments during tuning or monitoring.

• Fast time response for transient conditions and throttle changes
• Precision across the listed AFR ranges so small adjustments are visible
• No free-air calibration required when used with this controller
• Weld-in bung included for secure sensor mounting

What outputs and compatibility options does the gauge support?

This gauge provides a 0–5V analog output compatible with most engine management systems and dataloggers, plus a clear digital display for in-cockpit monitoring. The 52mm housing fits the common 2-1/16" pod size, making it adaptable to many vehicles and installations.

• 0–5V analog output for AFR logging and closed-loop controllers
• Fits standard 52 mm instrument holes and most aftermarket pods
• Interchangeable black/silver bezels and black/white faceplates for visual customization
• Confirm device compatibility by model/serial on the product nameplate

Which fuels and AFR ranges are supported and how are they displayed?

The gauge displays AFR and outputs corresponding 0–5V signals over fuel-specific ranges so you can tune for gasoline, ethanol blends, E85, or methanol. Lambda values are also supported if you prefer stoichiometric ratios instead of AFR numbers.

• Gasoline: AFR 10.0–20.0 (0–5V mapping)
• E85: AFR ~6.6–13.2 (0–5V mapping)
• Ethanol: AFR ~6.14–12.3 (0–5V mapping)
• Methanol: AFR ~4.4–8.8; Lambda range 0.68–1.36

What is included and how easy is installation?

The kit ships with everything needed to install and start using the wideband gauge: sensor, bung, harnesses, bezels, faceplates, and connectors, plus an instruction sheet. Basic mechanical and electrical skills are sufficient for most installs; welding the bung is recommended for long-term sensor location, while the harness and plugs simplify electrical hookup.

• 1x UEGO gauge assembly with digital display and LED needle
• 1x 4.9 LSU wideband sensor and weld-in O2 sensor bung
• Wiring harnesses, connectors, and installation instructions included
• Interchangeable bezels and faceplates for customized appearance

Who this is for: This FHRHRY wideband UEGO kit is aimed at tuners, performance enthusiasts, and workshop technicians who need reliable, fast AFR readings for engine tuning, dyno work, or monitoring. It’s ideal for gasoline or alcohol-fueled applications where a compact 52mm gauge, accurate 4.9 LSU sensing, and a 0–5V output for datalogging or ECU integration are required. Verify compatibility using the model/serial information on your device before purchasing to ensure the parts match your application.