There is a second solution to the Axxera AV614BH Backup Camera Mod Reverse with radio.
The control box behind the instrument panel has a provision to connect a monitor. There is a yellow video cable and a white audio cable.
You can install a small monitor on your dash. Connect it up to the monitor leads at the control box. Add ignition switched 12+ and you will then have a dedicated backup screen independent of the Axxera.