SKU: 42968470521

AEM X-SERIES WIDEBAND GAUGE

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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.

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    SKU: 42968470521

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    Gris
    Charlottesville, US
    ★★★★★ 5
    The heartbreaker
    Format: Audiobook
    Oh my gosh, why did I wait so long to read/listen to this book? I loved it so much I literally read it in less than record time. The chemistry between Rowan and Kyleigh was amazing and Kyleigh and her brother Conor’s bond was so heartwarming. The full cast of narrators did such a phenomenal job of bringing the characters to life that the story played out like a movie in my head and I ate it all up. Tropes: 💞Forbidden 🏒One Night Stand Secret Romance 💘 Reformed Playboy 🥅Hockey Romance 🚶‍♂️🚶🏻‍➡️Brothers Team Mate Narrator Cast: • Sean Masters • Erin Mallon • Connor Crais • JF Harding • Troy Duran • Teddy Hamilton • CJ Bloom
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    Reviewed in the United States on March 13, 2026
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    Alexciz
    Lake Worth, US
    ★★★★★ 4
    THE P@SSION IN THIS STORY!!!
    Format: Kindle
    Wow! How could I ever forget how amazing Piper Rayne is?! Her writing is SO GOOD and captivating that I had to force myself to slow down as I just didn’t want this book to end. The MMC was super sweet and strong and loyal and not afraid to feel what he’s feeling. No, is is NOT a simp, he is just mature and once he decided he was in love, instead of running away in fear, he started making moves to show it. That is one who is in touch with his emotions for sure. Rowan was a dream boyfriend that I wish were real!! Then we had our FMC, Ryleigh who was a bit emotionally stunted due to something she had seen. She was NOT looking for Mr. Right, just Mr. Right now but boy oh BOY did the sparks fly between these two!! 🥵😮‍💨🔥. Their chemistry was off the charts and the spïcy scenes were so fre@king hot. Just woa, had me fanning myself constantly. The way they were portrayed as a couple showed a lasting connection that I was cheering for from chapter one. This was such an amazing story that I had to switch to reading it as well as I couldn’t stop when I got out of my car. (This started as an audible book but quickly became my every book)! With narrators like: Sean Masters,Erin Mallon, Connor Crais, JF Harding, Troy Duran, Teddy Hamilton and CJ Bloom?! there was no WAY I wasn’t buying this a fre@king all star cast like I’ve never had in a book before. These are literally almost all of my favorites, I was totally geeking out. All in all a great feel good story full of passion, heat, hurt and healing. Loved every minute of it. The side characters were so powerful I hope each guy gets his own book!
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    Reviewed in the United States on January 20, 2025
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    Colleen S
    San Leandro, US
    ★★★★★ 5
    An amazing book!!!
    Format: Kindle
    This was another amazing book by Piper Rayne! The nest is one of my favorite series (top 2 of all time)! The love story between Kyleigh and Rowan was beautifully written! I love the found family in this series! They always tell each other when they are messing up and always help each other fix their mistakes! The banter between them is soo well written. I highly recommend this book and the audiobook! The full cast audio book is beyond amazing!!!! It truly brought this wonderful story to life! The narrators did a fantastic job and really made me feel like I was a part of the story! I am such a sucker for a full cast audiobook! Another great job Piper Rayne and all the narrators that helped tell this awesome story!!!
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    Reviewed in the United States on December 12, 2025
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    Colleen S
    Houston, US
    ★★★★★ 5
    This book was amazing!
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    I absolutely loved this book! Avery and Knox were beyond perfect for each other. Rebecca Jenshak did such an incredible writing this book and these characters. The brothers relationships in this family is wonderful. Everyone steps up to help take care of each other and it is heart warming. This book had low angst which I loved! I am really enjoying the start to this series and I cant wait to read the next book! The duet audiobook was incredible! Erin Mallon and Teddy Hamiliton did a fantastic job bringing this book and these characters to life! I highly recommend this book, audiobook, and series!
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    Reviewed in the United States on April 22, 2026
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    Kerri
    Massapequa, US
    ★★★★★ 4
    Banter, a bit of angst, found family, and a hot, tattooed bad boy who’s really a totally softie
    Format: Kindle
    This was a fun, easy read. It has all the things I love in a sports romance...banter, a bit of angst, found family, and a hot, tattooed bad boy who’s really a totally softie. Knox is kind of a mess at the start. He’s super talented, but has a reputation problem after getting kicked off his motocross team. He’s desperate for a second chance, which leads him to Avery, a former Olympic gymnast recovering from an injury. She’s trying to get her confidence back, and somehow these two end up helping each other. They can't stand each other at the beginning. He says ALL. THE. WRONG. THINGS. Evenutally, their friendship builds into something more. It felt natural and sweet. I liked that they both had their own stuff going on. Avery’s inner struggle was really relatable, and Knox’s bond with his brothers, especially with Flynn, added a ton of heart to the story. The beginning was little slow, and the ending felt a little rushed. Overall, though? I had a great time with this book.
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    Reviewed in the United States on July 27, 2025

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