I was playing around looking at the interior from different angles in shift+u mode, and I noticed that none of the needles moved, or in cars where it's digital, the speed stayed at 0 and the rev bars/lights don't show up.

Multiplayer and your car was standing?
Then it would be known, as the mirrors and gauges of the other cars are the same, strange thing anyway

I belive it was multiplayer, as i dont think the server would phrase that muhc detailed info on