3 MSR4115 Installation Disconnect Battery Before you begin, turn off the vehicle ignition and disconnect the battery negative terminal. Remove Screws Remove the two screws from the top of the unit, and seal the holes with the plastic film provided to ensure that no water is able to enter the unit. Installing the Unit 1. Affix the supplied mounting paper to the dashboard in the desired mounting location. 2. Carefully cut and remove a rectangular- Mounting shaped section of the Hole dashboard usin