You don't say what year you have but it seems consistent with the 2006+ Frontiers. The 2006 and up have idiot lights masquerading as a gauge.
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I have a '05, they have true pressure gauges. While at a stop, the pressure will drop and RPMs are fine and remain at idle. When revving, the pressure will rise with the RPMs to a degree.
As long as you are somewhere between got some pressure and the top of the gauge, you should be fine. Be concerned when it shows 0 pressure and motor is running. Keep in mind though, some pressure is > than 0 pressure.
Based on this photo, that would be where mine is when driving down the road at non revved RPMs. At a stop light, it would dip to 1/2 distance to low part and upon acceleration or revving it would go to 1/2 distance to high side.
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As long as you are somewhere between got some pressure and the top of the gauge, you should be fine. Be concerned when it shows 0 pressure and motor is running. Keep in mind though, some pressure is > than 0 pressure.
Based on this photo, that would be where mine is when driving down the road at non revved RPMs. At a stop light, it would dip to 1/2 distance to low part and upon acceleration or revving it would go to 1/2 distance to high side.
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