The dash boards are provided with indicator instruments and optical signals controlling the running of different parts of the vehicle. Optical signals are for hand brake, foot brake, battery charging, trailer I direction, trailer II direction, upper beam, general lighting, temperature alert, pressure alert, fuel level alert, brake liquid alert. In association with instrument panels are included oil pressure transmitters, thermo switches and flexible shafts, all this products included in the range of electric and electronic equipment produced by ELECTROPRECIZIA.