Can I trust that little gauge?????
Our 07 Dodge - 5.9 Cummins - has a gauge like this on the air filter The owner's manual says to depend on this gauge to tell you when to change the filter. In fact, on page 391 it says never...
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I would go by that little gauge. In our equipment the filter may last anywhere from hours to years before needing cleaning, depending on conditions. A dirty filter will provide cleaner air to the engine than a clean filter will. When the filter gets to be dirty enough to cause exessive air retriction the gauge will tell you.
