I find today's bright dashboards really distracting while driving backroads at night. I don't need to see any of the instruments while struggling with crummy rental car headlights, to see hidden deer or the next turn. Some have a feature when the "radio" display can be turned off, yet the backlight is still on, UGH. Note: LCD displays often let a lot of light through, despite the blank display.
Short of covering it with a crumpled up shirt, I've not tried anything else. I'd prefer a simple "off" option.
Why not try a dark tint "static cling" see through window shade?
Maybe not this one, but something darker?https://www.amazon.com/KwikShade-Quality-Window-Sunshade-Windshield/dp/B07DNZV68J