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 don't go by the gauge, I remove and examine the filter. When it's dirty, I replace it with a Napa 9946.
