If your vehicle has this feature, the gage is located above the switchbank in the center of the instrument panel. It monitors the engine air filter.

As the filter gets dirty, the yellow indicator will begin to rise. When it reaches the red/orange change area, the filter should be replaced.

After replacing the filter, reset the gage by pressing in the yellow reset button at the bottom of the gage.

If you have a Caterpillar® diesel engine, also see your Caterpillar® Operation & Maintenance Manual.