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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At 87k miles I'd say your do for filter #3 :W 
You can get these at Geno's garage for $29
Air filters are pretty important with diesels.
You can get these at Geno's garage for $29
Air filters are pretty important with diesels.
