I have a "TireGard" TPMS made by Show Chrome. It has two pressure monitors that screw onto the valve stem. I figured knowing the pressure in the front tire and in one rear is better than not knowing any pressures while on the road. However, I've read that people warn against their use with rubber valve stems, the theory being that the centrifugal force of the added stem weight can snap the stems. However, in searching the forums and internets, I can't find any instances where this has actually happened to someone.
Do any of you use a TPMS on your trike? If so, did you install metal valve stems or did you use the stock rubber stems?