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Could be the Oil Pressure Sending Unit. I do recall GMC having issues with the instrument cluster on 2003's. Try slapping the dash when the gage reads zero.
To review, you have two temp sensors, one for the gauge on the dash and one for the computer. If you unplug the sensor for the computer the reading will be minus 30 degrees or over 300 which will make it very hard to start. Unplugging the sensor for the gauge would have no effect on the computer. According to the wiring diagram, the wire for the temp gauge is green, and the wires for the temp sensor for the computer are yellow and black.
Could be the oil pressure sending unit or the gauge on the dash. You might want to have the pressure checked with a mechanical gauge, or replace the sending unit.
You may want to hook up an external oil pressure gauge to the engine to ease your mind. This would give you a regular number of the pressure. Compare it to the factory gauge in the dash. Those in dash gauges were not all that precise. If the engine is not having bearing noise I can see nothing to worry about.
The oil pressure sending unit is located on the engine block, passenger side by the Distributor. Good luck and make sure you get the right sending unit, there is the simple unit that only turns on a low oil pressure light and the other will send signals to the oil pressure gauge.
HEY,
YOU SEEM TO BE ON THE RIGHT TRACK. I WOULD START WITH THE SENDING UNITS. GM LOVES TO PUT TWO OF THE ON A CAR. ONE FOR THE GUAGE AND ONE FOR THE DASH LIGHT. UNLESS YOU HAVE NOTICED ANY BIG CHANGES IN OIL PRESSURE I WOULD THINK IT IS THE SENDER(SWITCH) FOR THE LIGHT. THEY ARE NORMALLY LOCATED AROUND THE AREA OF THE OIL FILTER HOUSING.
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