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AEM X-Series Wideband Gauge 52mm 2 1/16" O2 UEGO Air Fuel AFR Controller 30-0300

AEM X-Series Wideband Gauge 52mm 2 1/16" O2 UEGO Air Fuel AFR Controller 30-0300

Regular price $139.99 USD
Regular price Sale price $139.99 USD
Sale Sold out

Custom Bundle: No

MPN: 300300

Features-6: Auto dimming feature

Includes: Black bezel and black dual faced faceplate

Features-4: 52mm gauge diameter and slim 0.825” gauge depth

Features-5: Gauge cup depth only .200” deep!

Features-2: Compatible with vehicle/system voltages up to 16V

Display Type: Digital

Features-3: Can display AFR values in hundredths of %

Features-1: Includes Bosch 4.9LSU wideband UEGO sensor

Style: Racing

Includes 2: Bosch 4.9LSU wideband UEGO sensor

Gauge Type: Digital Air/Fuel Ratio

Diameter: 52mm (2-1/16”)


Performance Part: Yes

Non-Domestic Product: No

Other Part Number: 300300 / AEM 30-0300

Warranty: 1 Year (excluding sensor)

Fitment Type: Performance/Custom

Color: Black

Manufacturer Part Number: 300300

Material: Plastic

Superseded Part Number: 30-4100

Vintage Part: No

Modified Item: No

California Prop 65 Warning: Cancer & Reproductive Harm

Specifications-6: 0-5V Output Lambda values from .58 to 1.23

Brand: AEM

Specifications-5: CANbus Output Lambda values from .55 to 2.00

Type: Fuel Gauge

Interchange Part Number: New seven-segment center display,87% larger than the 30-4110,30-4100,AEM A/F Gauge,AEM Wideband Controller Gauge,AEM Wideband A/F Ratio Gauge,AEM Air Fuel Ratio Gauge with 4.9 Bosch Sensor

Return Policy: 60 Day Free Return

OE/OEM Part Number: 30-0300

Specifications-2: Display Lambda values from .55 to 2.00

Universal Fitment: Yes

Specifications-1: Display Gasoline values from 8.0:1 to 20.0:1 AFR

Specifications-4: CANbus Output Gasoline values from 8.0:1 to 20.0:1 AFR

Specifications-3: 0-5V Output Gasoline values from 8.5:1 to 18.0:1 AFR

The AEM X-Series Wideband Gauge is the perfect addition to any racing vehicle. With a 52mm gauge diameter and slim 0.825” gauge depth, this digital air/fuel ratio gauge is both sleek and functional. It comes with a black bezel and black dual-faced faceplate, and is compatible with vehicle/system voltages up to 16V. This fuel gauge also features an auto-dimming feature, a display type of digital, and can display AFR values in hundredths of %. The AEM X-Series Wideband Gauge includes a Bosch 4.9LSU wideband UEGO sensor and is capable of displaying Lambda values from .55 to 2.00. 

Product Information

This AEM X-series Wideband UEGO Air Fuel Sensor Controller Gauge is mainly designed to gauge or sensor the current fuel ratio for certain vehicle models, giving a precise estimate for peace of mind. Its AF Ratio is 30-0300 and it measures 2 1/16th inches in diameter and comes in a striking black. Read and report values correctly and enjoy the very readable features of this reliable unit.

Product Identifiers

Brand: AEM
Manufacturer Part Number: 300300

Product Key Features

Performance Part: Yes
Vintage Part: No
Style: Racing
OE/OEM Part Number: 30-0300
Display Type: Digital
Color: Black
Universal Fitment: Yes
Material: Plastic
Superseded Part Number: 30-4100


Item Width: 5.400 
Item Diameter: 52mm-2-1/16in
Item Weight: 1.5lb

Shipping Terms & Conditions

  • We ship WORLDWIDE, please contact us directly for quotes on shipments to Hawaii, Guam, Puerto Rico, Alaska and all Other Countries OUTSIDE of the USA.

    • For quotes please send us a message with the following info:

      • Address, Phone number, Business Name.

      • Is this a Residential or Commercial address? (shipping to a business is a lot cheaper in some cases.) 

      • PLEASE NOTE if this is a Commercial address, access to a Loading Dock or Forklift is MANDATORY

  • Buyer is Responsible for the Cost of Return Shipping & Handling. 

  • Actual Pictures shown (You Will Receive This Item)

  • Please Examine Pictures for Any Wear and Tear Before Purchasing

  • Please Make Sure to Match the Part Number with Your Stock Item to Ensure Compatibility

  • Item is sold AS-IS, no warranty. 

  • Imported directly from Japan

  • For freight shipments, upon delivery, please do not sign the release documents without fully inspecting the outer packaging for noticeable signs of damage. The freight companies will not let you open up the packaging prior to signing the documents, therefore, you must note any signs of damage based on the external packaging. Shipping insurance is provided by the freight company, not by Turbo Tingz. If you sign the form and do not note any possible damages, the freight company will be relieved of all responsibilities and you will not be reimbursed for any damages done to your shipment caused during shipping.  You must notify Turbo Tingz of any damages caused by mis-handling during shipping. PLEASE DO NOT SIGN THE RELEASE FORM OR LET THE DRIVER LEAVE WITHOUT FIRST INSPECTING THE PACKAGING FOR POSSIBLE DAMAGES.    


  • No item will be accepted for returns after the warranty period has elapsed. 

  • Any items returned within 14 days, and are not warranty related issues will be charged 20% restocking fee. (example: An item no longer needed or purchased the wrong item)

  • Items must be in the same condition it was sold and fully assembled.  

  • We must receive all of the parts that were included in the sale for the warranty to be valid. (THE RETURNED ITEM MUST MATCH THE ORIGINAL PICTURES)


This item is sold in AS-IS condition - No Warranty.  

DISCLAIMER: By purchasing this item, you agree with all our terms and conditions and understand our warranty conditions.


PayPal - For U.S. Customers Only.  According to PayPal rules and regulations we will ship ONLY to the confirmed address on the PayPal payment . Phone number is a MUST. We can not ship without providing your phone number. Confirm the shipping address before making your payment. If you have any questions, please give us a call.  

We do not accept PayPal payments for customers outside of the continental United States.   

Visa, MasterCard or Discover - For U.S. Customers Only. Your billing information must match the information on your card. We do not accept Visa/Mastercard payments over the phone.


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