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Oil sending unit

(1990 Ford Ranger)
in Booneville, MS on September 04, 2010
My oil pressure guage goes up fine when I start out but then drops when I slow down and as I drive longer it goes down and stays there. Is this due to the oil sending unit or oil pump and where are these located on this engine?
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on September 28, 2010
its the oil pump and the oil pump is located in the oil pan
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on September 28, 2010
its the oil pump and the oil pump is located in the oil pan
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