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

Monitor your engine's air-fuel mixture in real time with a 52mm smoked gauge and wideband O2 sensor. This kit gives you a clear digital readout of your air-fuel ratio, helping you tune for performance, fuel economy, or both. The smoked lens looks subtle during the day and lights up with a bright LED display at night.

This gauge is designed for 12V cars and includes everything you need for installation. The wideband oxygen sensor provides accurate readings from 10:1 to 20:1, so you can see exactly what your engine is doing under load or at idle. The smoked tint gives your dashboard a clean, race-inspired look without being flashy when the car is off.

Installation is straightforward with the included English manual and mounting hardware. The gauge connects to the sensor with clearly labeled wires, and the sensor itself fits standard M18x1.5 bungs. Whether you are tuning a modified engine or just want to keep an eye on your fuel mixture, this kit gives you the data you need at a glance.

Key Features and Benefits

- 52mm gauge size that fits standard dashboard pods and mounting holes

• Smoked lens that hides the display during the day and reveals bright LED numbers at night

• Wideband O2 sensor with a measurement range of 10:1 to 20:1 for accurate tuning feedback

• Includes English manual and all mounting hardware for a straightforward installation

• Works with 12V DC electrical systems common in most cars and trucks

Who Is This For

- 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

• Drivers of modified or turbocharged vehicles that need precise mixture monitoring

• Anyone replacing a failed or inaccurate narrowband gauge with a wideband upgrade

Usage Scenario

Mark had just finished installing a new turbo kit on his daily driver. The car felt strong, but he had no way to know if the fuel mixture was safe under boost. He mounted this 52mm gauge in his A-pillar pod, connected the sensor to the exhaust bung, and within minutes he could see his air-fuel ratio climbing into a safe range at full throttle. Now he drives with confidence, knowing he can spot a lean condition before it causes damage.

Micro Comparison

Basic narrowband gauges only tell you if the mixture is rich or lean, not by how much. This wideband kit gives you a precise numeric readout from 10:1 to 20:1, so you can tune with accuracy. The smoked lens also looks cleaner than a bright chrome bezel, blending into the dashboard when not in use.

Specifications

- Gauge size: 52 mm / 2.0 in

• Working voltage: DC 12V

• Signal line voltage: 0-1V

• Sensor thread: M18 x 1.5

• Sensor wrench size: 22 mm / 0.9 in

• Measurement range: 20:1 to 10:1 air-fuel ratio

• Output voltage: maximum ≥900 mV, minimum ≤50 mV

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

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

• Starting time: ≤10 s

• Heating resistance: 8.5 to 9.5 Ω

• Internal resistance: 200 to 300 Ω

• Material: plastic gauge housing

• OEM reference: 0258006028

Package Includes

- 1x air-fuel ratio gauge

• 1x wideband O2 oxygen sensor

• 1x English installation manual

• Mounting and installation hardware

Why You Will Love It

You get professional-grade wideband monitoring without the complex wiring of a standalone system. The smoked lens keeps your interior looking clean, and the bright LED display is easy to read at night. It gives you the peace of mind that comes from knowing exactly what your engine is doing.

Questions and Answers

Question: Does this gauge work with any 12V car?

Answer: Yes, it is designed for 12V DC electrical systems found in most cars, trucks, and SUVs.

Question: Is the sensor a wideband or narrowband type?

Answer: It is a wideband O2 sensor with a measurement range of 10:1 to 20:1 air-fuel ratio.

Question: What thread size does the sensor use?

Answer: The sensor uses a standard M18 x 1.5 thread, which fits most aftermarket bungs.

Question: Does the gauge come with installation instructions?

Answer: Yes, the kit includes an English user manual and all necessary mounting hardware.

Question: Can I use this gauge with a turbocharged engine?

Answer: Yes, wideband gauges are ideal for turbo and supercharged engines to monitor fuel mixture under boost.

Question: How do I connect the wires?

Answer: The white wires connect to the heater circuit (one to ground, one to ACC power), the black wire is the signal, and the gray wire is the signal ground. The gauge green wire connects to the sensor black wire.