The invention relates to a method for the manufacture of a switching device with a sensor unit located at a measurement end of a casing sleeve and connected to an electronic circuit located on a support received in the casing sleeve, and with a connection part located at a rear end of the casing sleeve. The method is characterized in that the sensor unit, support and connection part together with a shielding sleeve surrounding the support are assembled to form a dimensionally stable module and the latter is subsequently inserted in the casing sleeve, where it is received in fixing manner. According to a further aspect, the invention relates to a module for a switching device.