oil pump on 2002 Ford Expedition

I have a 2002 XLT 46 Expedition. I was driving in cold weather on 1/2/09 and have 115K on the engine. I was at 65MPH and the oil gauge started moving from high to low quickly and then the engine shut down with engine light on. I have changed the battery, the cable wire and posts. The engine starts now, but again loses oil pressure after 10 mins. Is this a sending problem (electronic), oil pump go out (no oil spilling out). Any input would be appreciated. Thanks

by in Mesa, AZ on January 25, 2009
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1 answer 2 comments
ANSWER by , January 26, 2009
There's a oil pressure sending unit located behind the oil filter cost is about 10 to 20 dollars
COMMENT by , January 26, 2009
Thanks for your response!
COMMENT by , December 04, 2010
is there a way to test unit