a method and apparatus is disclosed for injecting a temperature sensitive probe into a tire to be cured in a mold which is at least in part heated by a steam cavity . the probe is utilized to monitor cure conditions and provides an electronic input signal to control the cure . the probe is carried by a movable member in a housing mounted in the mold with one side of the movable member being exposed to , and thereby worked on , the steam in the cavity so that the steam pressure itself is utilized to inject the probe .