52mm Digital Air Fuel Ratio Gauge | Narrowband O2 Sensor for 12V Racing Cars

Monitor your engine's air-fuel mixture with a 52mm digital AFR gauge and narrowband oxygen sensor. This kit is built for 12V petrol racing cars and delivers real-time LED readings to help you tune for performance.

Keeping the right air-fuel ratio is critical for engine health and power. This narrowband O2 sensor works within a 0-1V signal range and sends data to the digital display. The gauge has a smoked face and LED readout, making it easy to see at a glance. It is designed for 12V vehicles and fits a standard 52mm gauge pod.

The sensor uses an M18x1.5 thread and a 22mm wrench for installation. It responds quickly to changes in exhaust oxygen content, helping you spot lean or rich conditions. The kit includes a wiring guide for the gauge and sensor, though professional installation is recommended due to the precise nature of the connection.

Whether you are tuning a race car or upgrading a daily driver, this AFR gauge gives you the data you need. The narrowband design is best for vehicles that already use a 0-1V oxygen sensor, so check your car's compatibility before ordering.

Key Features and Benefits

- 52mm gauge diameter that fits standard dash pods for a clean installation

• LED digital display that provides clear real-time air-fuel ratio readings

• Narrowband O2 sensor with 0-1V signal range that works with many petrol vehicles

• Fast response time under 100ms that helps you detect mixture changes quickly

• Smoked face design that reduces glare and looks sporty in any interior

• 12V operating voltage that matches most car electrical systems

Who Is This For

- Car enthusiasts who tune their own engines and want live AFR data

• Racing car owners who need a reliable gauge for track-side adjustments

• DIY mechanics upgrading a 12V petrol vehicle with a performance monitoring tool

• Drivers replacing a faulty narrowband O2 sensor and gauge set

Usage Scenario

Mark had just finished rebuilding the carburetor on his project car. He needed to know if the air-fuel mixture was safe before taking it out on the road. After installing this AFR gauge and narrowband sensor, he watched the LED display climb to a steady reading during idle. A quick rev confirmed the mixture stayed in range. With the gauge mounted in the dash pod, Mark now checks his AFR every time he drives, catching lean spots before they cause damage.

Micro Comparison

Unlike wideband AFR kits that require a separate controller and higher cost, this narrowband set works directly with your car's existing 0-1V sensor signal. It is a simpler, more affordable option for vehicles already equipped for narrowband operation. The 52mm size fits standard gauge openings without adapters.

Specifications

- Gauge diameter: 52mm / 2.0 in

• Working voltage: DC 12V

• Signal line voltage: 0-1V

• Sensor thread: M18 x 1.5

• Wrench size: 22mm / 0.87 in

• Output voltage max: ≥900mV

• Output voltage min: ≤50mV

• Response time (600mV to 300mV): ≤100ms

• Response time (300mV to 600mV): ≤100ms

• Starting time: ≤10s

• Heating resistance: 8.5 to 9.5Ω

• Internal resistance: 200 to 300Ω

• Material: Plastic shell

• Item weight: 400g / 14.1 oz

Package Includes

- 1x Air Fuel AFR Gauge

• 1x Narrowband Oxygen Sensor

• 1x English Manual (gauge installation only)

Why You Will Love It

You get a complete gauge and sensor set that installs without extra modules. The smoked face and LED display give your dash a professional racing look. With real-time AFR feedback, you can tune with confidence and protect your engine from costly damage.

Questions and Answers

Question: What voltage does this gauge and sensor work with?

Answer: This kit works with a 12V DC electrical system. The sensor operates on a 0-1V signal.

Question: What thread size is the oxygen sensor?

Answer: The sensor has an M18 x 1.5 thread and requires a 22mm wrench for installation.

Question: Is this a wideband or narrowband sensor?

Answer: It is a narrowband oxygen sensor that works within a 0-1V voltage range. It is not a wideband sensor.

Question: Does the gauge fit a standard 52mm dash pod?

Answer: Yes, the gauge has a 52mm diameter and fits most standard gauge pods and mounting holes.

Question: Does the package include both the gauge and the sensor?

Answer: Yes, the package includes one AFR gauge and one narrowband oxygen sensor. The manual covers gauge installation only.