The LED display is a good tool for full system information on vehicles COMPATIBILITY GROUP I and II. Remember that these groups can not show the information on the screens of the vehicle, or because they can not stand still D4P does not support it or because the vehicle itself.
If you only install D4P in the rear of the vehicle we recommend that you mount the display in the front. So you will see the information without removing the front view. Remember that you can also place the display at the top end of the roof and view the display in the mirror. Such a configuration is recommended when you are installing front and rear sensors so that the front display would provide information of the front and rear sensors rear display