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Using resistance signal, because the resistance signal safety, small fluctuations, convenient wiring, don't need a electric tank sensor, without any danger. There and voltage is easily affected by the current size, oil, fuel tank sensors need electricity, so the problems due to the circuit fault cause of tank fire, explosion, such as security risk. Sensor with a shaking device, to avoid the due to causes such as downhill, brakes, road heading up swings.