1997 Dakota 318 CI. 113,000 Oil pressure fluctuates

The oil pressure reads 25 idling and about 45 at highway speeds. Sometimes running at highway speeds it will show 25 and minutes later it will go back to 45 lbs. It does not change if you slip it in neutral and rev the
engine. Nothing sounds like low oil pressure no loud valves or bearing even at start up. Any sugestion as what the problem may be? Thanks
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Hopefully it is just the Oil Pressure Switch or the gauge in the dash that is failing. You might first try disconnecting and reconnecting the wiring harness from the oil pressure switch and see if the connection was just corroded or loose. Here is a photo of the oil pressure switch:
http://www.rockauto.com/ref/SMP/SMPDetail2.html?PS284.jpg
KVH wrote:

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On 6 Jul 2006 21:07:12 -0700, snipped-for-privacy@rockauto.com wrote:

I agree that it is likely the sending unit (it is not a switch because it does not only have a on/off function) ----------------- The SnoMan www.thesnoman.com
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KVH wrote:

Had a problem like that on a 98' Dakota. Oil pressure would be about the same as yours and change going down the road. Put a new sending unit and it still did the same thing. Turns out it was the oil filter and it was a brand new fram. went and got a Wix Filter and oil pressure jumped up to almost 55 to 60 PSI- The highest its ever been. The Wix oil filter solved the problem- so try a WIX filter.
Brian 92' Power Ram150 93' Power Ram 350 CTD
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