Holley Header Carb SelectorView CartHolleyTVYouTubeTwitterFacebook
What item is right for you?
Ask our experts:


Suggested Retail: $442.95
Your Price: $397.95
FREE Shipping on orders over $100*
Buy Now

Small Part and Tuning Kits

Holley Wideband 02 Controller with Gauge

PART #: 534-201

UPC #: 090127662281

Want to closely monitor Air/Fuel ratios on your carbureted or EFI vehicle? Holley has just the product for you. Holley is proud to introduce the Holley Wide Band O2 Controller with gauge.

A wide band oxygen sensor is the ultimate addition to any carbureted or EFI vehicle. It will accurately measure any air/fuel ratio between 10:1 and 18:1. This allows the engine tuner to read the air/fuel ratio in real time for extremely accurate tuning.

The 534–201 kit is intended for the consumer who wants to be able to accurately measure air/fuel ratios so the perfect tune up can be obtained. The 534–201 can also be upgraded later for use with an NTK sensor by simply reconnecting a jumper loop and purchasing the NTK sensor (P/N 534–194).

The Holley Wide Band O2 gauge features a 3–digit numeric display along with a 40 segment bar graph. With the ultra–high intensity light emitting diodes you will be able to see your Air/Fuel ratio even under direct sunlight.

The P/N 534–201 is designed to operate in street or race environments and will withstand heat, dirt, and vibration. The Holley Wide Band O2 gauge will fit in a standard 2–1/16” gauge pod.
Holley Wide Band 02 Controller with Gauge

  • Controller Features: Small weather-sealed unit for convenient mounting
  • Easy Installation
  • Accurately measures A/F ratio between 10:1 and 18:1
  • Will accommodate a Bosch or NTK sensor
  • Includes Bosch LSU4 Sensor
  • Aides in tuning for maximum power and fuel economy
  • Gauge Features: Features a 3-digit numeric display and 40 segment multicolor bar graph for a quick read
  • Ultra-high intensity light emitting diodes for easy viewing even in direct sunlight
  • Standard 2-1/16” diameter for ease of mounting in a standard gauge pod
  • Built for race environments to withstand heat, dirt, and vibration
  • Connects to vehicle light switch to dim the gauge during night time viewing

Technical Information

Shipping Dimensions
L 7.750 in. x W 5.250 in. x H 3.250 in.
Weight 2.000 lb.
*Free Shipping & Handling only offered to the continental US on orders over $100.

Holley | Hooker Headers | Earl's | Weiand | NOS | Flowtech
Copyright Holley Performance Products, Inc.
NASCAR© and NASCAR Performance© are registered trademarks of the National Association for Stock Car Auto Racing, Inc.
Web Index | Terms Of Use | Vendor | Corporate | Search