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It is a pressure or a vacuum switch. It is the sort that puts a warning light on if the engine oil pressure or steering hydraulic pressure is low or the brake vacuum is low.
It appears remarkably clean for the first two and if it had dropped out of one of the places where such things are fitted the effects would be immediate. Perhaps it is an old one left behind after a new one has been fitted, resting somewhere inaccessible to the mechanic and finally dropped out to cause confusion and bewilderment.
Such switches are usually marked with the pressure or vacuum values.
It could, once the engine is running it then keeps the fuelpump running with the oil preasure switch and if the oil preasure drops it can stop the pump,but should start back up unless theres a bad fuelpump relay,
I would check the oil pressure sensor and the oil pump itself. You can take the sensor out and use a mechanical gauge to check the oil pressure. If the oil pressure is within specs, you need a new sensor, if not, you need a new pump.