<p>A direct connection of the Rally GT lighting (delivery date before 2020) to the vehicle's on-board power supply would lead to a short circuit.<br /><br />Rally-GT odometers from delivery date 2020 are designed to be more short-circuit-proof. If the lighting of these devices is connected directly to the on-board power supply, the lighting will not work. <br /><br />The battery holder is attached directly to the back of the Rally-GT with self-adhesive Velcro tape.</p>