What this really is is a switch that tells you when there is not enough oil in the engine. It shuts the engine off and won't let it restart so you do not ruin the engine because of lack of oil.
It is really not needed as long as you make sure that they always is enough oil in the engine.
It usually is not very expensive, but you can tell for sure by going to this website and putting you r model type and code number in. It will bring up the entire parts list.
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