An electronic unit includes an electronic box (1) and a “snap-in” inflation valve (2) made up of a shaft (5) and of an abutment head (6) which are separated by a neck (7) in the shape of an annular groove. The electronic box (1) and the inflation valve (2) are rigidly connected by element, firstly, of an annular piece (22) housed in the neck (7) of the valve body (3), which piece is continued by at least one arm (23) for connecting the annular piece with the electronic box (1), extending externally along the abutment head (6) and in a continuation of the latter, and, secondly, of members (27) for fixing the connecting arm (23) on the electronic box (1).