The ST3403 Wideband Air-Fuel Ratio (Lambda) gauge is an essential tool for any serious tuner. With its dual digital red numeric and multi-color radial LED displays, you get a clear and precise readout of your vehicle's air/fuel ratio or lambda values—whichever you prefer. The user-selectable format ensures that you can tailor the gauge to your specific tuning needs.
This gauge features adjustable scaling, allowing for customized calibration based on specialty fuel types, ensuring maximum display resolution for your application. It also includes a peak lean value recall function and programmable alarm settings, enabling quick data review and timely alerts while driving.
Thanks to its built-in photo sensor, the display automatically adjusts its intensity based on ambient lighting conditions, although you can manually control this feature with a simple switch connection. The ST3403 also offers 0-5 Volt analog and serial data outputs, making it compatible with data loggers, ECUs, and other devices for real-time closed-loop feedback, which is critical for optimizing your vehicle's performance.
Additionally, the Pro-Control output allows for automatic management of other power systems based on specific lambda conditions, enhancing your tuning capabilities. Each gauge is supplied complete with a wiring harness and includes a Bosch LSU4.9 sensor for reliable readings.
Universal Fitment: The ST3403 is designed to be a universal fitment, making it compatible with various vehicles. However, it's recommended to conduct research to confirm compatibility with your specific vehicle model.
Users appreciate the clarity and responsiveness of the ST3403 gauge, particularly noting its ability to provide real-time data that aids in fine-tuning performance. Many find the adjustable scaling feature beneficial for different fuel types, while the automatic display adjustment is praised for its convenience during night and day driving.
Other Part Numbers:
Autometer #amST3403
⚠ WARNING:
Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov

AutoMeter is an aftermarket company that started in 1957. The company specializes in creating high precision gauges for various automobiles. The company was founded by Vern Westberg and initially poured sand castings in their family’s backyard. Today, Autometer is considered the leading brand when it comes to vehicle instrumentations and is being used by a lot of enthusiasts worldwide.
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