The oil pressure is measured downstream (at the outlet) of the engine-driven pump. The main reason being that you want to be sure that the pressure at the pump’s output is enough to properly lubricate the engine parts. The pressure of a standard oil pump fitted in a reciprocating engine’s lubrication system is between 50-100 psi, however, this will depend on the size and loading of the engine itself. The pressure sensor can be either electrical or mechanical (bourdon tube).
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