You imply that the problem went away after adding two quarts of oil. That could suggest a problem with the oil pump pickup tube. If it is loose at the pump or cracked it could be allowing air to enter - adding the oil covered the area preventing air from entering. To check I would drain the oil to the add mark on the dip stick and verify the problem returns, than add oil to verify the problem goes away. In addition verify that the dip stick reading correlates with the correct fill amount per the manual.
Assuming your in dash oil pressure gage is electric it depends on a voltage regulator to supply a controlled voltage to it and the other dash instruments. A problem with this regulator or your charging system/battery could be causing the gage to read low at idle.
The warning light is just that a "warning", typically set very low indicating near zero oil pressure.
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Today's Featured Article - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let�s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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