I have gained much notoriety on this site for my Rimstock wheel refurb tale of woe and the members wonderful support along the way, now I finally have my rims back I need to understand how the tyre preasure monitors work, the reason for this question was that when I removed my wheels some 5 weeks ago I wrote on each sensor which corner the wheels came off with tipex, now back the sensors are in a bag with the tipex rubbed off