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Holley Wideband 02 Controller

Includes LED gauge and all the necessary hardware for a fast, easy installation

PART# 534-201

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Want the ability to closely monitor Air/Fuel ratios on your carbureted or EFI vehicle? Wideband O2 sensors do not suffer as great a loss of data accuracy due to voltage and ground fluctuations. This is due in part to their spreading their range of accuracy over 5 volts typically, from 10:1 to 18:1. A wide band oxygen sensor is the ultimate addition to any carbureted or EFI vehicle. This kit will accurately measure any air/fuel ratio between 10:1 and 18:1 allowing the user to read the air/fuel ratio in real time for extremely accurate tuning. The (P/N 534-201) kit is intended for the individual who wants to be able to precisely measure air/fuel ratios to obtain the perfect tune. The (P/N 534-201) comes standard with Bosch LSU4 sensor, but offers the flexibility to 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 included in the kit 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 toughest 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.


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


Product TypeWideband 02 Controller
Part Number534-201
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