Mine is a 22 so this is how I’ve got mine setup.Just catching up but it probably doesn't prevent the radio/dash screen from illuminating?
With FORscan you need to enable center stack controls and silent mode. You then get a button in the settings to switch silent mode on and off. I think this only works on 22s with sync 4 and is the same as dark mode. The difference being dark mode can only be switched on and off by FORscan change versus silent mode being able to be switched on and off in the sync settings menu.
With silent mode enabled you will get no interior dome lights or exterior mirror lights/etc. when opening a door or pressing lock/unlock on the key fob.
I believe headlights/parking lights can be keeped off by switching from auto to the off position.
To turn the sync display on/off there is a button next to the tune knob and I also believe it can be turned off in the settings menu.
When driving with night vision I think you will still have to deal with a couple things.
I don’t remember exactly what all will be on but I believe you will still have the illumination on the dash. The blue lights on the gauge needles and the LEDs that illuminate the buttons and maybe the screen in the gauge cluster.
You will also have to deal with the brake light illumination that will reflect in the mirrors.
I just do the quick and easy cover the dash with a towel or something and the brake light glare doesn’t seem to bother me too much.