Gledewen Wideband UEGO AFR Gauge 52mm with LSU 4.9 Sensor — 24-Color LED, Fast 20ms Response

The Gledewen 52mm Wideband UEGO Air-Fuel Ratio Gauge Kit is a real-time AFR/Lambda monitor and controller that pairs a fast LSU 4.9 sensor with a reversible 24-color LED display for precise tuning on street and race engines.

Accurate air-fuel monitoring is essential when dialing in ignition timing, fueling maps, or diagnosing combustion issues. This 52mm (2-1/16") Gledewen kit combines a wideband controller gauge, LSU 4.9 oxygen sensor, and harnessing to deliver rapid 20ms response readings across 8.0:1 to 20.0:1 AFR (0.55–2.00 Lambda). The unit provides configurable readouts, multiple calibration options, and outputs for logging or aftermarket engine management systems.

How does the gauge display and help me read AFR quickly?

The faceplate uses a sweeping 24-color LED arc plus a central numeric display that can show three or four digits. Colors help you scan at a glance while the numeric readout gives precise values, and the display is reversible for preferred mounting orientation.

• 24-color graduated LED bar for visual leaning/tuning cues
• Configurable 3- or 4-digit numeric modes for precision
• Selectable readouts: AFR, Lambda, or O2% to match tuning workflows
• Auto-dimming to reduce glare during night driving

What sensor and accuracy features can I expect?

The kit ships with an LSU 4.9 wideband oxygen sensor factory-trimmed for reliable output and fast response. It reports changes in AFR rapidly and includes both resistor-trim (rCAL) and free-air (ACAL) calibration methods so tuners can choose the best approach for their setup.

• LSU 4.9 sensor for industry-standard accuracy and speed
• Typical 20ms response time for near-instant feedback
• Factory trim resistor included for simple, recommended calibration
• ACAL available for users who prefer free-air recalibration

How do I install and connect the Gledewen UEGO kit?

Installation is straightforward: mount the 52mm gauge, wire power/ground, and fit the sensor into an exhaust bung. The kit includes harnesses, a PWR/IO cable and basic connectors so you can get the system powered and reading quickly.

• Mountable 52mm diameter gauge fits standard pods or dash holes
• Wiring: red = 12V+, black = ground; compatible up to 16V systems
• Includes sensor harness, PWR/IO cable, butt connectors, and nut
• RS-232 and 0–5V analog outputs for data-logging or ECUs

What inputs and outputs does the controller offer for tuning workflows?

The controller provides both analog (0–5V) and serial RS-232 outputs so you can feed readings to aftermarket engine management or datalogging tools. It also supports CAN mode for calibration workflows that interact with engine systems.

• 0–5V analog output for simple logging and gauge interfacing
• Serial RS-232 output for higher-fidelity data capture
• CAN mode option for integration with CAN-capable tuning tools
• Configurable display modes to match logging targets

Who this is for: The Gledewen Wideband UEGO AFR Gauge Kit is aimed at hobbyist and professional tuners, performance builders, and any driver wanting accurate, fast air-fuel feedback. It suits street-driven cars, track vehicles, and custom projects where precise AFR/Lambda readings, simple installation, and flexible outputs are required. With factory-trimmed sensor options, multiple calibration paths, and both visual and data outputs, this kit helps you tune more confidently without needing complex setup steps.