Kayteg1 wrote:
I had the add-on TPMS that I moved from motorhome to my sedan with rubber steams.
The only issue was that centrifugal force would bend the steam to point where sensors were touching rims and rubbing the paint off.
A piece of duct tape solved that.
But if you plan to keep the wheels, I think putting TPMS inside the wheels is worth the initial cost.
I have 12 years old car with build-in TPMS and original batteries still work.
Many have found, myself included, that the weight of the sensor with eventually crack the stem resulting in a leak. I have run them both ways and strongly recommend the metal stems.