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Hello, is this on a 6 or 8 cylinder?
If there is a problem with the oil pressure sending unit than it would cause the "check gauges" light to illuminate. Verify that the connector is firmly connected to the sensor which is located to the left of the oil filter. If it is still has a good connection I would recommend replacing the oil pressure sending unit, this is a fairly common problem on the Grand Cherokee's.
Here is a picture showing the location.
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