Universal 52mm Air Fuel Ratio Gauge | LED Digital Display with Wideband O2 Sensor Kit

Key Features

• Wideband Readout — It shows a numeric air-fuel ratio across a 10:1 to 20:1 range.
• 52mm Gauge Size — The gauge measures 52 mm (2.05 in) across.
• Smoked Lens — The smoked lens looks subtle by day and lights the bright LED numbers at night.

Product Specifications

• Material: Plastic gauge housing
• Dimensions: 52 mm (2.05 in)
• Measurement range: 20:1 to 10:1 air-fuel ratio
• Electrical system: 12V DC
• Sensor thread: M18 x 1.5
• Signal line voltage: 0-1V
• Output voltage: maximum ≥900 mV, minimum ≤50 mV
• Response time (600 mV to 300 mV): ≤100 ms
• Starting time: ≤10 s
• Heating resistance: 8.5 to 9.5 Ω
• Internal resistance: 200 to 300 Ω
• Package contents: 1 air-fuel ratio gauge, 1 wideband O2 oxygen sensor, 1 English installation manual, mounting and installation hardware

What It Is / How It Works

This Universal 52mm Air Fuel Ratio Gauge is a 52mm gauge with an LED digital display, paired with a wideband O2 sensor. It shows the air-fuel ratio as a digital readout while the engine runs.

Who It's For / Use Cases

It suits car enthusiasts tuning their engine for performance or fuel economy, DIY mechanics who want real-time air-fuel ratio data without a full standalone system, and drivers of modified or turbocharged vehicles that need precise mixture monitoring.

How to Use / Care

1. Use the gauge on a turbocharged engine to watch the fuel mixture under boost.
2. Confirm the sensor's M18 x 1.5 thread matches your aftermarket bung before fitting it.
3. Read the air-fuel ratio on the LED display, which covers 10:1 to 20:1.

How to Choose

Start with the face size. This gauge is 52mm, which fits standard dashboard pods and mounting holes.

Check that your vehicle runs a 12V DC electrical system, as most cars and trucks do.

Narrowband gauges show only whether a mixture is rich or lean, while wideband gauges show a numeric ratio. Match the type to how precisely you want to tune.

Frequently Asked Questions

Does this gauge work with any 12V car?
It is designed for 12V DC electrical systems found in most cars, trucks, and SUVs.

What thread size does the sensor use?
It uses a standard M18 x 1.5 thread, which fits most aftermarket bungs.

Is the sensor wideband or narrowband?
It is a wideband O2 sensor with a measurement range of 10:1 to 20:1 air-fuel ratio.

Does the kit come with installation instructions?
Yes. It includes an English user manual and the mounting hardware.

Can I use this gauge with a turbocharged engine?
It is designed to monitor fuel mixture under boost on turbo and supercharged engines.