I recommend replacing the oil pressure sensor with a genuine Nissan part when it fails. I have read several posts at a Pathfinder site where people have replaced the sensor with an aftermarket replacement part only to have it not work right out of the box or fail not long afterwards. The oil pressure sensor was used in the early years of the R51, then around 2007 or 2008, it was replaced with an oil pressure switch, rendering the oil pressure gauge into a "dummy gauge." It'll either read halfway when the oil pressure is good or will read nothing, if the oil pressure is too low or there is a bad switch/circuit. The sensor is much more expensive than the switch. This all said, even if you have the early type sensor with an actual functioning oil pressure gauge, you will rarely see much movement of the needle; the only time you might see the needle position anywhere other than about halfway on the gauge is when you start the engine cold, in which the needle may read a little higher than normal until the oil warms up.
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