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Holley Standalone Air/Fuel Wideband Gauge Kit

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  • Completely Standalone, Easy-to-Read Analog Gauge
  • Great for EFI or Carbureted Applications
  • Slim-Style Composite Carbon Case
  • Adjustable LED Warning Light Allows User to Set Low Trigger Points
  • Choose from White or Black Face
  • Features 0-5 Volt Output for Data Logging
  • Includes Bosch LSU 4.9 Wideband O2 Sensor (Compatible with All Fuel Types)
  • Reads in Gasoline Scale Only
  • 270° Sweep Pointer Makes Gauges Easy to Read
  • Internal Microprocessor Controls the Pointer Movement Ensuring Accurate Movement
  • Peak Recall Button Gives User the Ability to View Min/Max Readings
  • Includes a 5 ft, 6-pin Weathertight Sensor Harness
  • Allows Mounting Where Very Little Dash Space is Available
  • 4 ft. Power/Ground/Lighting Harness Included for Flexible Mounting Locations
  • Spin Lock Ring Threads Allow for Simple and Secure Mounting
  • CNC Machined Billet Aluminum Bezels with Anodized Finish
  • Bezels are Threaded for Easy Replacement
  • Multiple Bezel Options Available for a Customized Look (PN: 553-145SB | 553-145BKB)
  • Limited 90-Day Warranty

Holley's Standalone Air/Fuel Wideband Gauge Kits provide an accurate air/fuel ratio measurement along with 0-5 volt reference input for all carbureted and EFI fuel systems. These kits are 2-1/16" O2 gauge kits with 0-5 volt analog output and fully standalone which allow for data logging capability. The Holley Standalone Air/Fuel Wideband Gauge Kit feature a Bosch LSU 4.9 wideband O2 sensor and the adjustable LED warning light allows the user to set low trigger points.

The Holley Standalone Air/Fuel Wideband Gauge Kit is designed specifically for the use with all EFI or carbureted systems and comes in either a black face with white lettering or white face with black lettering. The gauge's internal microprocessor controls the pointer's movement to ensure accurate movement in street, off road, and racing conditions. Each of these gauges are tested to insure a top quality and accurate product.

Additionally, these kits include a include a slim-style case with 5-foot weathertight sensor harness, as well as a 4-foot power/ground/lighting harness for flexible mounting locations and will be backed by the manufacturer for a 90 days.

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Spec Sheet
Warranty90 Days
California Residents: Prop 65 Warning


The Standalone Air/Fuel Wideband Gauge Kit is easily mountable in every conceivable position and Holley has made installation on these kits remarkably simple.

  1. Disconnect the negative (-) battery cable from the vehicle battery.
  2. Mount gauge in desired location and connect wiring harness to the gauge.
  3. Install O2 sensor.
  4. Reconnect negative (-) battery cable.

If you have any other questions or need assistance please give us a call.


All Holley Performance Products Limited Warranties are extended to the original consumer only. This Limited Warranty is not assignable or otherwise transferable. There are no warranties that extend beyond those stated herein. Holley Performance Products offers no other warranties expressed or implied beyond this Limited Warranty.

In the event of an alleged defect in material or workmanship, Holley Performance Products' responsibility is strictly limited to repair or replace the defective product. Holley has no other obligation expressed or implied. Final warranty determination will be in the sole discretion of Holley Performance Products. Holley shall not be responsible for; (a) actual or alleged labor, transportation, or other incidental charges; or (b) actual or alleged consequential or other damages incurred by use of any product of Holley Performance Products.

To initiate the warranty process, the consumer must return the alleged defective product to the place of purchase with a dated receipt and completed applicable warranty claim tag. Warranty claims will be rejected if the date of purchase cannot be established by the consumer. Do not send products directly to Holley Performance Products. Holley Performance Products assumes no responsibility for products sent directly to Holley Performance Products.

This Limited Warranty sets forth specific legal rights. The consumer may have other rights as a result of variations in state laws or provincial laws. This Limited Warranty supersedes all prior warranty statements.


Holley Performance Products warrants its new Holley, Flowtech, Hooker, NOS, and Weiand products to be free from defects in material and workmanship for a period of 90 days from date of purchase.

Holley Performance Products Limited Warranty specifically does not apply to products, which have been (a) modified or altered in any way; (b) subjected to adverse conditions, such as misuse, neglect, accident, improper installation or adjustment, dirt or other contaminants, water, corrosion, or faulty repair; or (c) used in other than those applications recommended by Holley Performance Products. Holley Performance Products also does not warrant, and disclaims all liability for products used in racing activities and/or applications other than those specifically recommended in the current brand catalog.

Holley limits the warranty on Metallic Ceramic Coatings to be free from defects in material and workmanship for a period of 90 days from the date of purchase. This limited coating warranty does not apply to any products which have been subjected to adverse conditions, such as high heat encountered during engine break-in or if used during any racing activity.