A method for installing a geometric reference marker on a substantially flat horizontal ground for calibration of electrical and/or electronic components of a motor vehicle, said installation method comprising:
- positioning the vehicle on the ground with wheels of the vehicle parallel to a longitudinal axis of the vehicle;
- and
- positioning geometric referencing equipment on the ground around the vehicle, said referencing equipment comprising a set of distinct elongate plates forming rulers, each ruler having a planar bottom face resting at least partially on the ground and being sufficiently rigid not to be deformed in a plane of said bottom face, the positioning being performed by placing the rulers of the adjustment equipment on the ground according to a predetermined pattern, at a predetermined distance from the vehicle.