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If there is no oil pressure, you should not be running it long enough to worry about the charging system, or any blow-by out the breather! Especially if it has been sitting for a while, and the bearings are bone-dry of oil, you have probably "toasted" them already! To verify that it is not simply a stuck gauge, disconnect the oil line to the gauge, at the engine block. Then, crank it over and see if any oil is pumped out. If not, DON'T run it any more 'til you find out what's wrong! The oil pump screen could be sucked full of debris, or the oil pump could have failed, or simply need to be primed. "Pro" engine builders have a pressurized cannister to prime engine lube systems before startup. If the tractor sat a long time unused, and you want to try to prime the oil pump and lube system, you can try this: For one-time use, you can get a new pump-up garden sprayer for about $9.00, then cut the "wand" off before the nozzle, and use a piece of gas-line rubber hose to connect it to a fitting screwed in the block, where the oil gauge connect is. Put some clean, fresh motor oil in the sprayer, and pump it up, forcing the oil into the engine's oil galleries and oil pump. After doing this, put the fittings back as they were, and you will either have oil pressure, and be able to run the engine, and evaluate it's condition, or, if still no oil pressure, the oil pan will have to come off, for access to the oil pump.
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