HUD mode reflecting off of the windshield at night

My truck’s speedometer is not always accurate, so I downloaded an speedometer app to give me a better idea on my speed. This app has a HUD mode that flips the image so I can place my phone on the dash and use the reflection as HUD. I was thinking that this sort of feature would be great for Waze.

Just a suggestion.

Been suggested before, didn’t gain much traction.
But more importantly, get your speedo fixed!!

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I’ve wondered the same - is there a app or hack that will flip the entire screen for the whole OS?
(Probably something only an Android could do)

No mechanical speedo will ever be completely accurate. Not sure about trucks but cars can be off by double digits.