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The working principle of the sensor is that the oil pressure sensor has a sliding resistance inside. Use the oil pressure to push the potentiometer of the sliding resistance to move, change the current of the oil pressure gauge, and change the position of the pointer. The amplified pressure signal is connected to the oil pressure indicator through the signal line, and the ratio of the current passing through the two coils inside the oil pressure indicator is changed to indicate the oil pressure of the starting engine.