52mm Air Fuel Ratio Gauge with Narrowband O2 Sensor | 12V Stepper Motor

Monitor your engine's air-fuel mixture with this 52mm air fuel ratio gauge. It works with a narrowband O2 oxygen sensor and fits 12V vehicles that use a stepper motor. The gauge helps you keep an eye on combustion efficiency so you can adjust performance or catch issues early.

This gauge uses a stepper motor design. It needs to be powered on to return the pointer to zero. If the pointer does not return to zero when the gauge is off, that is normal behavior. The gauge reads from 10 to 20 air fuel ratio, giving you a clear view of your engine's mixture.

The black plastic housing has a 52mm diameter, which fits standard gauge pods and dash openings. It connects to your vehicle's 12V electrical system. The included narrowband O2 sensor links to the gauge so you get live readings directly from the exhaust.

Installation requires wiring the sensor and gauge according to the included instructions. The white wires on the sensor are for the heater and do not have polarity. One white wire connects to the battery negative or chassis ground. The other white wire connects to the ACC line of the ignition switch. The black wire on the sensor is the signal line, and the gray wire is the signal ground. The green wire from the gauge connects to the black wire of the sensor. The gray wire connects to the battery negative terminal.

Key Features and Benefits

- 52mm gauge diameter that fits standard dash openings and gauge pods

• Stepper motor movement provides smooth and accurate pointer response

• Narrowband O2 sensor included for direct exhaust reading

• Reads air fuel ratio from 10 to 20 for monitoring mixture

• 12V DC operation works with most car and truck electrical systems

• Black plastic housing gives a clean racing look to your dashboard

Who Is This For

- Car enthusiasts who want to monitor their engine's air fuel ratio for tuning

• Mechanics and DIY installers adding performance gauges to a vehicle

• Owners of gasoline-powered cars, trucks, or motorcycles with a 12V system

• Anyone replacing a broken or inaccurate factory air fuel gauge

Usage Scenario

Mark noticed his truck was running rough and using more fuel than usual. He installed this 52mm air fuel ratio gauge in his dash pod and connected it to the narrowband O2 sensor. The gauge showed a lean mixture during acceleration. After adjusting the fuel trim, the gauge returned to a balanced reading. His truck ran smoother and fuel economy improved.

Micro Comparison

Many basic air fuel gauges use a simple LED bar graph that shows only rich or lean. This gauge uses a stepper motor needle for a more precise analog reading across the full 10 to 20 range. It also includes the narrowband O2 sensor, so you do not need to buy a separate sensor for installation.

Specifications

Diameter: 52 mm / 2.0 in

Material: Plastic shell

Voltage: DC 12V

Color: Black

Weight: 400 g / 14.1 oz

Interchange Part Number: boost controller

OEM Number: AFR

OE Reference: 0258006028

Package Includes

- 1x Air Fuel Ratio Gauge

• OR 1x Sensor

• OR 1x Gauge Cup

Note: The gauge cup must be purchased separately. The gauge does not include a gauge cup.

Why You Will Love It

You get a clear reading of your engine's fuel mixture without guesswork. The stepper motor needle moves smoothly so you can see changes in real time. Installing this gauge gives you the same kind of monitoring that professional tuners use.

Questions and Answers

Question: Does this gauge work with diesel engines?

Answer: No, this gauge is designed for gasoline engines. It uses a narrowband O2 sensor that reads exhaust from gasoline combustion.

Question: Can I install this gauge myself?

Answer: Yes, if you have basic wiring skills. The sensor and gauge connect with color-coded wires. Follow the included wiring diagram for proper installation.

Question: Why does the needle not return to zero when the car is off?

Answer: This is normal for stepper motor gauges. The needle only returns to zero when the gauge receives power. It will reset once you turn the ignition on.

Question: What size hole do I need to mount this gauge?

Answer: You need a 52mm diameter hole. Most standard gauge pods and dash openings will accept this size.

Question: Does the gauge come with a mounting cup?

Answer: No, the gauge cup is sold separately. The package includes either the gauge, the sensor, or the cup, depending on the option you select.