Try wearing polarized sunglasses while the HUD is activated. You can barley see it. Now, if the brand of tint film that is applied had polarization, well then your HUD display will be useless. Secondly, if your located in the US, check with your state to find out if tinting your front windshield is legal. I know if someone here in Illinois had that done on their car, on the public road, say good by to your car, it would be impounded on the spot. If its a show car, on a trailer then your fine.
"I have the simplest tastes. I am always satisfied with the best."