Here is an idea/speculation. Instead of a HUD, Tesla will announce AR Glasses that will show the driver all useful information such as speed, speed limit, directions, battery level etc. Model 3 will be shipped as revealed without a traditional dash, if you don't want to see this information on the centre screen you need to purchase these AR glasses. All Model S/Xs produced from April 1st will include the AR vision. For older S/Xs and Model 3 it will be a $2,500 accessory.