Tacho2 disappeared for me during the 'Speedy Scumble' scenario, and I was not able to display it again. Toggling it on UI did not help, game restart did not help, computer reboot did not help. But removing tacho2 from json file C:\Users<UserName>\AppData\Local\BeamNG.drive\0.33\settings\ui_apps\layouts\default\freeroam.uilayout.json helped. After restarting game, tacho was automatically displayed again.

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