I apologize for the confusion with my question. I guess what I was asking is whether the actual poppet valve, which I called the valve stem, needed to be removed. Then all I need to do is remove the cap, and install the sensor on top of the valve? So I guess I would have to remove the sensor to service air into the tire, correct? Sorry if these questions seem stupid. Never taken a tire apart, but I know that the valve is normally removed when the tire is replaced.
Jim & Judy & Bella (Black Lab) & Sunny (Retriever)
2010 Thor Hurricane 33T
TOAD 2014 Ford Focus LE