An assembly having an electrical connector and a modular housing. The cooperation of positioning projections of the modular housing with stabilizing sections of the electrical connector provides a stable and precise mating between the electrical connector and the modular housing in four directions which are perpendicular to the plane of insertion of the electrical connector into the modular housing. The cooperation of latches of the electrical connector with latch receiving recesses of the modular housing provides a stable and precise mating between the electrical connector and the modular housing in two directions which are in line with the plane of insertion.