Wrknrvr Posted June 4 Report Share Posted June 4 I am curious if anyone on the forum has a vacuum gauge in there instrument panel. And what is it for. What is your normal reading at idle and at highway speed. Curious, Vern Quote Link to comment Share on other sites More sharing options...
Deezl Smoke Posted June 4 Report Share Posted June 4 Typically it is an air filter restriction gauge. Should be plumbed in between the air filter and turbo. It tells you how much restriction your air filter is causing as it gets dirty. Quote Link to comment Share on other sites More sharing options...
Darryl&Rita Posted June 4 Report Share Posted June 4 Two options for a dash mounted vacuum gauge; air filter or fuel filter restriction. Sometimes they're disguised as a differential gauge, but it's still a vacuum gauge at heart. No manifold vacuum on modern diesels, all boost. Quote Link to comment Share on other sites More sharing options...
rickeieio Posted June 4 Report Share Posted June 4 As a side note: I suggest y'all look at your owners manual before getting worried about a little air filter restriction. Most trucks have a restriction indicator on/near the filter housing. It will tell you when to replace or clean your filter. On our farm equipment, the manual says when it indicates service is due, wait until the next servicing, which for us was the next morning. Remember, the more clogged the filter, the better job it does at removing particulate. Quote Link to comment Share on other sites More sharing options...
jenandjon Posted June 5 Report Share Posted June 5 Could be a fuel vac gauge. Basically the same as the air gauge. It lets you know when the fuel filter is getting plugged. Quote Link to comment Share on other sites More sharing options...
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