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Title: They simply do not work
Review: I bought these for several cars and encouraged friends to get them before I had experience with them. (Foolish.)They simply do not work. You can get your pressure far below their set pressure and they will continue to show no problem.Totally unreliable. Plus, since you are driving around with your valve stem pin pushed in, if these things develop a leak themselves, you lose tire pressure.I think they are dangerous.
