A mechanical pressure switch is used by the oil pressure sensor to operate. When the pressure falls below the predetermined level, the pressure switch, which is installed in the oil line, is actuated. When this occurs, the button shuts a circuit that triggers the warning light or alarm, according to the expert at ECU Remapping Dorset. In order for the pressure switch to activate at the proper pressure, it is often calibrated to the particular engine. For more information about ECU Remapping Dorset visit https://www.aboutinsider.c...