The 7 Best Wideband Gauges of 2021

1. Best Overall Wideband Gauge: AEM 30-0300 X-Series

The AEM 30-0300 X-Series is our best overall model. It features patented X-Digital technology, which gives these controllers the capability to display values that other wideband gauges cannot.

For instance, this one has a much wider range of 8 – 20 AFR and can display these values to the hundredths of %.

Additionally, this technology results in a much faster response time, which improves the wideband feedback control, thereby enabling you to carry out a safer, robust, and more accurate tuning.

On the outside, the gauge has a visually striking faceplate and a 7-segment center display that is 87% larger than other AEM units, which makes it much easier to read.

Other features include compatibility to car electrical systems that run up to 16 volts, auto-dimming, and a wiring harness plus a weld-in stainless-steel bung in the kit.

However, the package will not include a boost pressure gauge. But, you can always get one separately if you do not already have one. 

2. Best Budget Wideband Gauge: AEM 30-4110 

The AEM 30-4110 wideband gauge is a more budget-friendly option for those that do not want to spend much. What makes it one of the best in the market is that it features the latest and most accurate Bosch LSU 4.9 sensor.

Additionally, the unit requires no free air sensor calibration as it is laboratory calibrated beforehand. It also gives a wider air-fuel ratio sensing range of 10 – 20 AFR on its digital display.

The gauge is inside a 2-1/16-inch (52mm) casing. This universal size ensures that it fits in most gauge pods for mounting anywhere inside the car.

Slight customization of the gauge’s design is also possible, with interchangeable black and white faceplates and interchangeable black and silver bezels, all of which are in the package.

Other features include a digital display with a .1 resolution, an outer bar graph with an LED needle, and a 0 – 5-volt analog output. 

The included wiring harness is a bit short, but it should still be more than enough for most engines and is not a big deal.

3. Fastest Wideband Gauge: Innovate Motorsports 3918 MTX

If you do not want to waste a lot of time waiting for readings, the Innovate Motorsports 3918 MTX is a perfect choice as it is one of the fastest wideband gauges on our list. This gauge provides a faster sensor frequency, and the analog output speed is also higher.

The unit comes with the top-performing Bosch LSU 4.9 oxygen sensor. It has an enhanced heater control for superior sensor performance in high-performance applications, such as in forced induction engines.

While doing this, a fast-analog output speed keeps the car’s ECU up to date with all air-fuel ratio changes in real-time for effective monitoring.

Other features include a large digital display in AFR or Lambda, a programmable digital needle, and a 52mm diameter gauge housing. Plus, it has interchangeable black and white faceplates and bezels.

However, calibration is necessary before use, but you will also get an instruction manual to help you with this, so it should not be a big concern.

4. Best Wideband Gauge for Gas Engine: Auto Meter 4379

Auto Meter’s 4379 is the ideal choice for those that drive gasoline engine vehicles. But it still has broad compatibility with most street and race car electrical systems because it can operate in either 12 or 16 volts. 

What's more, it has a digital segment display that shows the air-fuel ratio on a 10 – 17 range, with a resolution of 0.1. Combined with an external LED radial bar graph display, the kit gives you highly accurate readings and is easy to read.

The gauge also comes as a complete kit, including a Bosch LSU 4.2 oxygen sensor, 8-foot wiring harness, a weld-in stainless-steel bung, installation instructions, and mounting hardware for easy installation. 

On the downside, the accompanying LSU 4.2 O2 sensor is not as good as the newer 4.9 model in the AEM 30-0300 X-Series, and its AFR range is not very wide. However, the unit still performs quite well and has a 0 – 4-volt data output feed for laptop tuning, ECU, or a data acquisition unit.

5. Best Aftermarket Wideband Gauge: GlowShift GS-TCD02W

For an aftermarket wideband gauge, the GlowShift GS-TCD02W is excellent as it has a lot to offer. One of this product's key highlights is the self-calibrating function that ensures the gauge is at optimal performance from the start.

The display is also fantastic because it will allow for easy reading even at a glance. Also, you get to choose the display color you prefer from 10 options.

The 10-foot sensors harness is longer than what many aftermarket gauges will give you. And for the sensor, this gauge uses the advanced and highly accurate 4.9 LSU wideband oxygen sensor.

Because the mounting hardware and instructions are part of the package, you can be sure of an easy time setting up this wideband gauge.

While this model could be a little faster, the speed is still higher than most other aftermarket ones within its class out there.

6. Convenient Wideband Gauge Combo Set: AEM Display Set 

The AEM Display Set comes as a wideband gauge and a boost pressure gauge combo. Hence, you get the two important tools required for tuning your engine in one package.

The wideband gauge is quite impressive with its 10 – 20 AFR range, and it is supported by the pressure gauge’s -30 to 35 PSI range, which is ideal for both fuel injector and carburetor motors.

All have digital scales, with digital LED displays on the middle section and an outer LED needle, making the gauges easy to read. Also, you get a universal 52mm housing size, which can fit in most gauge pods.

Additionally, all of them come with interchangeable black and white faceplates, as well as black and silver bezels, which customize their looks to your preference. 

While this is a little more expensive option, it should be obvious as it comes as a set with two handy tools in one. If you consider the cost of buying them separately, it is clear you still get a good deal with this combo set.

7. Easiest Wideband Gauge to Install: Innovate Motorsports 3873 DB

With the Innovate Motorsports 3873 DB, you can be sure of a hassle-free time when it comes to the installation as it has with everything you will need. Better still, the manufacturer also provides clear directions on what to do.

Besides the easy installation, you also do not have any issues reading the data as this unit comes with a bright and clear LED display with two color options: blue and red.

Another element that makes this a unique wideband gauge is the powerful LogWorks software. The software will allow for high-speed wideband data logging. And users can also add several sensor interfaces or log data for 5 main parameters directly to a PC.

The few drawbacks are that this is a vehicle-specific gauge, and it may need recalibration before use. Recalibration is quite simple, and provided you have a compatible vehicle, you should not have any issues.