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Not sure what has an external sensor, but everything I've worked on has the an internal sensor. Two basic types, a flexible threaded rubber valve stem and a hard composite valve stem. They both have their ups and down's, but I prefer the hard ones as long as something doesn't hit it and it cracks(which I've only seen happen once).
Edit: There is supposed to be some kind of sensor safe can of tire sealer, but I carry around a plug kit and jar of rubber cement in my cars.
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