A pressure sensor for harsh environments such as vehicle tires, the sensor having a chamber partially defined by a flexible membrane, the chamber containing a fluid at a reference pressure. The solder paste provides excellent solderability, high corrosive resistance and a good shelf life, but not an offensive smell, during the soldering operation. An external sensor is disposed on an outer surface of the riser assembly, an internal sensor is disposed along the internal bore of the riser assembly, or both. The one or more identifiers can be visual andor tactile for each of the sealing ports.