Automotive oil pressure sensor refers to a micro electromechanical system integrating micro sensors, actuators, signal processing and control circuits, interface circuits, communication and electricity generation. Commonly used are silicon piezoresistive and silicon capacitive, both of which are micromechanical-electronic sensors generated on silicon wafers. The wiring mode of the electronic oil pressure sensor is completely consistent with the traditional mechanical sensor. It can replace the mechanical pressure sensor and directly connect with the automobile oil pressure indicator and low pressure alarm lamp, indicating the oil pressure of the diesel automobile engine and providing low pressure alarm signal.