You can use an old smartphone with HUD speed, GPS, compass, whatever you can find an app for. been using that for speedometer for awhile now in my truck simce the speedo is broken.with the elio's center line seating, i was thinking that a hud would be a nifty and functional alternative for an instrument panel. just to give u that aviation feel when driving. i suppose that after a while, it would just feel like the longest high speed taxi u ever did.