An electrical connector includes an insulative housing with a base and a mating tongue extending forwardly in a front-to-rear direction from the base, the mating tongue defining a first surface and a second surface opposite to each other. In an operating mode, the piston of the tensioning system, which is supplied with a hydraulic fluid, is supported against a tensioning rail with a non-positive fit, with the rail pre-tensioning the traction drive element. The example method also includes directing the second path to a second container containing a suspension material devoid of particles, retrieving a first transmission value of the first path through the first container, and retrieving a second transmission value of the second path through the second container.