SKU: 42968470521

AEM X-SERIES WIDEBAND GAUGE

Sale price$98.07 Regular price$108.97
Save 10%

Shipping Estimate
USA
  • USA
  • CAN

Ships within 48 hours · Estimated delivery Jul 11 - Jul 16

Promo Codes Available:

For Your Every Summer RSVP, with Code: SUMMER15

Description

AEM X-SERIES WIDEBAND GAUGESKU AEM30 0300 AEM X Series Wideband UEGO Air Fuel Ratio Sensor Controller Gauges are built upon unique, patented 100% Digital technology (Patent 9,575,030) that makes them the fastest responding wideband air fuel ratio controllers in independent testing*. The X Series Wideband UEGO AFR Sensor Controller Gauge (PN 30 0300) measures 2 1 16th inch (52mm) in diameter and features a modern, visually striking faceplate and new seven segment center display

SKU AEM30-0300

AEM X-Series Wideband UEGO Air/Fuel Ratio Sensor Controller Gauges are built upon unique, patented 100% Digital technology (Patent 9,575,030) that makes them the fastest responding wideband air/fuel ratio controllers in independent testing*.

The X-Series Wideband UEGO AFR Sensor Controller Gauge (PN 30-0300) measures 2 1/16th-inch (52mm) in diameter and features a modern, visually striking faceplate and new seven-segment center display that is 87% larger than the 30-4110 AEM Wideband Gauge center display. This creates the perception of a larger overall gauge, but in a common 52mm size for easy mounting. Its slim depth (less than one inch overall) and ultra-slim cup depth of .200-inches dramatically increases its application base and potential mounting locations.

The X-Series Wideband UEGO AFR Gauge has a user configurable display via buttons on the gauge face that allows you to change AFR values for different fuels, Lambda or O2%, change the center display to three or four digits, perform a free-air calibration if desired as the sensor ages, and change the CAN message ID when linking multiple X-Series Inline Controllers or X-Series Controller Gauges. A black bezel and black dual-faced faceplate for air/fuel and Lambda are included, and an optional silver bezel with white dual-faced air/fuel and Lambda faceplate is available (PN 30-0300-ACC, sold separately). An Auto Dimming feature is included. Locking connectors ensure a positive connection between the harnesses and gauge and a new single board design adds to the new gauge durability.

X-DIGITAL TECHNOLOGY

  • X-Digital wideband technology gives these controllers the ability to read and report values that other controllers do not, which can deliver more optimized engine tuning and a safer overall operating condition. The controller with high-speed digital implementation ensures no loss of signal fidelity and full transient response, making it able to identify the slightest fluctuations in AFR and output them in full value.

WHY RESPONSE TIME MATTERS

  • Faster response time improves wideband feedback control, and can provide a safer, more powerful and accurate tune. AEM Wideband Controllers with X-Digital technology can reduce deadtime and improve the performance of your vehicle through more accurate AFR tuning. Deadtime is the delay between when exhaust gas composition changes and when that change is reported by the O2 sensor. While flow of exhaust gases (transport delay) can affect deadtime, it is not the only source. Often, the sensing elements response to the gas is the largest contributor to deadtime when an engine is in high RPM under load.

When tuning an engine using wideband AFR feedback control on an inertia dyno, deadtime affects the data you are looking at because it is reported in a different operating location than when it actually occurred. This means with long deadtimes, whatever changes you make to the base fueling will likely be in the wrong location. This can be particularly dangerous to high compression and high-boost forced induction vehicles, and EFI systems that use feedback control to auto-tune.

Reducing deadtime improves wideband feedback control, and can provide a safer, more powerful and accurate tune. AEM Wideband Controllers with X-Series digital technology can reduce deadtime and improve the performance of your vehicle through more accurate AFR tuning.

FACTORY CALIBRATION RESISTOR OR FREE-AIR CAL, YOUR CHOICE!

  • The X-Series Wideband Gauge and X-Series Inline Controller support the popular Bosch 4.9LSU sensor and can utilize both the factory calibration resistor and free-air calibration methods**. This allows users to take advantage of the precise factory resistor calibration when a sensor is new but then allows for free-air calibrations if the user desires when the sensor ages. It is the perfect marriage of simplicity and accuracy!

WHAT IS A WIDEBAND UEGO AIR/FUEL CONTROLLER?

  • AEM's Wideband UEGO (Universal Exhaust Gas Oxygen, these Controllers are powerful, cost-effective tuning tools that allow users to accurately monitor the Air/Fuel Ratio (AFR) of their engine.

WHY USE A WIDEBAND AIR/FUEL CONTROLLER?

  • Accurate AFR data is critical when tuning an engine. Running rich (very low air/fuel ratio, excessive fuel) can cause a loss in power, while running too lean (very high air/fuel ratio, not enough fuel) may result in serious engine damage. Using a wideband air/fuel controller during the tuning process allows you to monitor AFR and adjust tuning parameters to optimize them for maximum power and efficiency. AEM has a comprehensive line of highly accurate, reliable wideband air/fuel controllers that can help ensure your vehicle is optimally tuned.

CAN I CHANGE THE AEM UEGO SENSOR CONNECTOR?

  • No. There is a laser-etched, calibrated resistor in the sensor's connector body. This resistor is specifically created for the exact sensor that it is attached to. Modifying this will invalidate the sensor output.

* Independently tested at 360° Product Testing (results reported on August 31st, 2015) against 17 competitors wideband UEGO Air/Fuel Controllers. AEM X-Series Inline with Bosch 4.9LSU wideband sensor and AEM X-Series Wideband UEGO AFR Gauge with Bosch 4.9LSU sensor recorded the fastest response times.
** Wideband UEGO sensors are wear items and their lifespan is determined by many factors including contamination from leaded fuels, automotive fluids, particulates, mechanical or thermal shock and from being unheated and exposed to the exhaust stream. Free-air calibration may correct drift as a sensor ages, but it is recommended that they are replaced as part of your vehicle maintenance program. When performing free-air calibration, please follow the procedure outlined in the instruction manual.

    Shared shipping only $24.99 in the lower 48 states.

    SS 9/8/22


    Shipping Notes
    • Free Standard Shipping on $100+ Orders to the USA.
    • Except Preorder products are shipped in 48 hours.
    • Delivery to the USA:
    1. Standard Shipping : 3-10 business days
    • If time is of the essence, please consider selecting expedited delivery for faster service.
    Exchange/Return Notes
    • We offer a 30-day return/exchange service after receiving.
    • Final sale items are not eligible for returns or exchanges.
    • To process your return/exchange, please contact us at [email protected]
    • Please click here for more details>>> Return & Exchange Policy
    SKU: 42968470521

    Discover Niche Categories That Outsell

    Top-Converting Item to Boost Your Average Order

    4.1 ★★★★★
    Based on 1061 reviews
    Sort
    Highest Rating
    Newest First
    Oldest First
    Product Reviews
    D
    Dom Miliano
    Grantham, US
    ★★★★★ 5
    Classy fully automatic watch - lots of bling too
    Watches with a mechanical movement are becoming more mainstream despite the impact of smart watches and quartz movement timepieces. With a pure mechanical watch, there are no concerns about battery charge so when you pick it up from the nightstand, all you would have to do is give the stem a twist to wind the main spring, reset the time and off you go - and that's only if it has stopped. If it hasn't stopped (it won't if you wear it every day or have a watch winder) you strap it on and you are all set. I gave this watch my regular accuracy test set against a clock linked to the atomic time source. To my great surprise, it was as accurate as one of my much more expensive mechanical watches (how much more expensive? This watch costs about the same as the sales tax on the most pricy watch in the closet !!) I use the included watch bracelet tool to remove a link from the watch to get a proper fit. Including the tool in the box saves you the $10 plus fee a jeweler might charge you to make the adjustment - very cool. And you probably will need to remove at least one link - some may need to remove two - since the bracelet has a generous size. Speaking of the bracelet, it's beautiful. I wore the watch today to church and a friend said it had "heavy duty bling" ... But she did say she thought it was beautiful and I concur. Finally, The way the bracelet clasp works is reminiscent of a Longines bracelet i have and that spells quality to me. The dial is black with chrome shiny minute markers so visibility in good light is excellent. I do not detect any glow in the dark markings on the hands or the minute markers - factor that in for your purchase decision. I see this watch as serving as your "good" watch for business wear, to don for a meal at a fancy restaurant or for that big date night. I think it has a classic look that (despite the bling of the bracelet) is conservative enough for anyone and any business situation.The only place I wouldn't wear it is to the beach or the gym despite the fact that it has claimed that it is waterproof to depths you probably will never experience. Accurate, beautiful, real quality that translates to good value and capable of being almost anyone's "good" watch. Recommended
    WAS THIS REVIEW HELPFUL?YesReportShare
    Reviewed in the United States on August 1, 2021
    M
    Verified Purchase
    Maidelyn Diaz
    Battle Creek, US
    ★★★★★ 5
    Es muy elegante
    Color: 3316:white band white dial
    The OUPINKE Automatic Two-Tone Skeleton Watch is a stylish timepiece that blends luxury design with mechanical craftsmanship. Its gold and silver stainless steel construction gives it an elegant, premium look suitable for both formal and casual occasions. Design & Appearance: This watch stands out with its two-tone bracelet and gold-accented bezel, creating a bold and sophisticated aesthetic. The dial features crystal-style hour markers, multiple subdials, and a visible skeleton window at the bottom that showcases the internal movement. These details add a high-end feel often associated with more expensive watches. Movement & Performance: It uses an automatic mechanical movement, which means it winds itself through the motion of your wrist—no battery required. This is a major advantage for watch enthusiasts who appreciate traditional watchmaking. The watch also includes useful calendar features such as day, date, and month indicators. Build Quality: The stainless steel case and bracelet feel solid and durable. The polished finish enhances its luxury appeal, although like most polished watches, it may show fingerprints or small scratches over time. Comfort: Despite its robust design, the watch is comfortable to wear. The bracelet is well-balanced, and the clasp keeps it secure on the wrist.
    WAS THIS REVIEW HELPFUL?YesReportShare
    Reviewed in the United States on February 18, 2026
    G
    Verified Purchase
    GJK
    Charlottesville, US
    ★★★★★ 5
    Exceptional quality
    I have only had the watch for a few days, but Oupinke watches are very high quality. It keeps time very well and serves as an attention grabber. Great value for the money. It isn't easy to determine where it was made, but it is a Chinese company. Don't stop there with preconceived ideas about cheap products and low quality from China. These watches are exceptional, high-end, and dedicated to creating a brand that endures and stands for quality, rather than simply turning a profit. I would put this watch against those that cost 3-4 times as much. If you are a watch enthusiast, they are worth adding to your collection.
    WAS THIS REVIEW HELPFUL?YesReportShare
    Reviewed in the United States on June 17, 2025
    S
    Verified Purchase
    Scott Mead
    Fort Morgan, US
    ★★★★★ 5
    Value
    Color: GZ3255Z:Two tone band&Blue dial
    Higher quality than I expected, especially for the price. I have recieved lots of compliments, but I have never told anyone what I paid for it. I use it for a daily wear, and when I go out for dinner.
    WAS THIS REVIEW HELPFUL?YesReportShare
    Reviewed in the United States on August 2, 2025
    T
    Verified Purchase
    Texas
    Fort Morgan, US
    ★★★★★ 5
    Good Watch - Hard To Adjust Band
    The good: Good quality. Keeps accurate time. The not so good: The not so good is not a problem with the watch but a problem with adjusting the metal band. And that is not the band's fault. That's my fault. To adjust the band so it fits the wrist one must take out links in the band. A tool comes with the watch to aid link removal. I just could not do it. So I replaced this band with another metal band that has a quick adjust magnetic closure.
    WAS THIS REVIEW HELPFUL?YesReportShare
    Reviewed in the United States on May 4, 2024

    recommand products