Yes, I can see how using the mirror version I could connect the system to the dashboard. The signal to each of the displays would be a PWM signal to each LED (as it light sensor and must control how bright the LED is). Running ther PWM signal through a small filter would convert it to a DC signal.
If I do implement this, it will be a while off as the new dashboard is not yet installed along with a new wiring harnesss, but I will allow for it in my design.
If I do implement it I will share my results.