This thesis activity is aimed at designing and building a prototype of an instrument for measuring the steering wheel angle and the steering wheel torque, with the vehicle stationary and in motion. The project has been carried out at the Turin-based company AMET Srl. The instrument prototype, called Electronic Level, must have an appropriate mechanical fixing system able to adapt to different types of steering wheels, it has intelligence onboard programmed for carrying out tests, storing data, processing CAN messages, and providing a PC interface for offline data processing. The proposed system consists of three components: the first one is the Electronic Level fixed to the steering wheel in three or four points to guarantee a secure and deterministic fixing, avoiding damages to the steering wheel and avoiding impediments regarding safety systems of the vehicle as airbags.