Last night when I turned off my 2004 ford explorer all the gauges worked bit this morning when I started my truck the all the gauges worked except the oil one and the check gauge light was onward would cause that

Sludged-up oil galley going to the gauge? Remove the oil cap and examine it and the underside of the valve cover. Look for any oxidation and build-up. If you find any, start using full synthetic oil, changing it every 6,000 miles or 6 months, whichever comes first. Its higher natural detergency will safely clean the engine.

Thank you I took off the cap and seen the sludge so I will try the synthetic oil and see if that works

Most likely this would be a Oil Pressure Sending unit which should be located on your oil pan some where, if it is the only gauge not working I see no reason to check fuses. Check the wiring of the part mentioned above.