I have a few cars and I service them myself. Checking tire pressure is especially important in the East Coast winter. My TPS kept telling me that my tires were dismounted after refueling. I went through several rounds of pressure adjustments and checks only to find that this gauge was still different from the car's system. I then went to another sensor and it read exactly the same as the car's TPS system. I then confirmed with the sensor at the gas station. The same thing. So this sensor I bought here is different from 3-4 pounds. Now he's useless to me if I can't trust what he reads. My advice is to buy something else.