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MTX-L Wideband Air/Fuel Ratio Gauge

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The MTX-L Wideband Air/Fuel Ratio Gauge is a dash-mount gauge kit that combines digital wideband accuracy and an affordable price! The digital wideband controller is built right into the gauge, so no separate wiring or control module is required. A large digital LED readout plus a 270-degree sweep "digital needle" combines the accuracy of a digital gauge with the instant recognition of an analog gauge. The gauge even features interchangeable faces and bezels to match your existing gauges!

The complete kit includes everything you need:

Digital, water-resistant 2 1/16" dash-mount gauge
Bosch LSU4.2 wideband O2 sensor
Exhaust weld bung
Programming / data logging cable
Software CD
Silver bezel, black bezel, white dial face, and black dial face
Sensor cable (choose 3 foot or 8 foot)

The gauge has two programmable analog outputs (0 to 5v) for data logging and engine management systems. Displays Lambda (0.5 to 1.52) or ratios for gasoline, diesel, methanol, E85, or LPG.

Enter desired order quantities below, then click the "Add selected quantities to cart" button.

Order Qty
Part No.

3878-004-3 FOOT

MTX-L Air/Fuel Ratio Gauge, 3 Foot Lead

$209.99In Stock


MTX-L Air/Fuel Ratio Gauge, 8 Foot Lead

$209.99In Stock
Related Product Groups
Wideband Air/Fuel Ratio Monitors


by PowerReviews
MTX-L Wideband Air/Fuel Ratio Gauge

(based on 1 review)

Ratings Distribution

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  • 1 Stars



Reviewed by 1 customer

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A must for carb tuning

By Stewart

from Cincinnati

Verified Buyer

Comments about MTX-L Wideband Air/Fuel Ratio Gauge:

Tuning Webers is a bit of a black art with much written about it, but this gauge makes it much easier. I set the main jets to a A:F of around 12.5 at idle but could actually see the mixture richening up as I full-throttled down the back straight at Mid-Ohio. A quick change to the air correction jet and I was 12.5-13.0 all the way down. Never would have known that without the MTX.

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