FHRHRY Wideband UEGO AFR Gauge 52mm with 4.9 LSU Sensor — Digital Readout & 0–5V Output

FHRHRY’s 52mm Wideband UEGO gauge kit is a complete digital air/fuel ratio monitoring system that includes a fast 4.9 LSU sensor, interchangeable bezels and faces, and a 0–5V analog output for logging or engine management.

This compact 2-1/16" (52mm) gauge assembly gives real-time AFR feedback in a durable package built for tuning and monitoring. It pairs a digital LED readout and color-changing LED needle with a weld-in sensor bung and full wiring harness, making it suitable for most cars, motorcycles, and custom projects where accurate wideband data is required.

How accurate and responsive is the FHRHRY wideband sensor?

The kit uses a 4.9 LSU wideband oxygen sensor and a matched controller to deliver rapid, repeatable AFR readings suitable for tuning and engine protection. The sensor responds quickly to changes and the controller reports values across gasoline, ethanol, E85 and methanol ranges without requiring free-air calibration.

• 4.9 LSU sensor for fast response and precise AFR changes
• Digital LED display plus color-shifting LED needle for quick visual cues
• Gauge reads gasoline AFR from 10–20:1; lambda 0.68–1.36
• 0–5V analog output compatible with most engine management systems and dataloggers

What mounting and wiring options does the kit include?

The 52mm housing fits standard gauge pods and can be surface-mounted or installed in custom panels. The package includes a sensor harness, a 4‑lead harness, butt connectors and installation instructions to simplify wiring and placement.

• 52mm (2-1/16") gauge housing fits common instrument openings
• Complete wiring: UEGO sensor harness and 4-lead gauge harness included
• Weld-in O2 sensor bung and butt connectors for a secure install
• Plug-and-play style connections for easier setup and datalogging

Which fuels and output ranges are supported by the gauge?

The controller translates sensor readings into infotainment on the dial while also providing a 0–5V proportional analog output for external systems. AFR and voltage mappings are provided for gasoline, E85, ethanol, methanol and lambda so you can connect the signal to aftermarket ECUs or data recorders.

• Gasoline AFR: 10–20:1 (mapped across 0–5V output)
• E85 AFR: 6.6–13.2:1; Ethanol AFR: 6.14–12.3:1; Methanol AFR: 4.4–8.8:1
• Lambda display equivalent: 0.68–1.36 across gauge range
• 0–5V analog output for real-time logging and ECU integration

What customization and durability features should I expect?

The gauge ships with interchangeable black and silver bezels plus black and white faceplates so you can match your dash or swap aesthetics quickly. The kit also includes a weld-in bung, and the sensor/controller pairing is designed to avoid periodic free-air recalibration when used together.

• Interchangeable black and silver bezels for visual customization
• Black and white faceplates to suit lighting and dashboard themes
• Weld-in bung and sensor for durable, workshop-grade mounting
• No free-air calibration required when used with the supplied controller

Who this is for: tuners, DIY engine builders, racers and anyone fitting aftermarket engine management who needs a compact, fast wideband AFR solution. Confirm compatibility by your device’s model number before purchase—parts are model-specific—then use the included harnesses and hardware for a straightforward installation. The kit comes complete with the gauge assembly, sensor, bung, harnesses, connectors, bezels, faceplates and instructions plus a 24‑month warranty and customer support for peace of mind.