Car software is a lot more involved than most of the people here would think. These days, the dashboard display is typically rendered by separate pieces of software. A pretty normal, moderately fancy rendering engine does all the animations and backgrounds while the really important information (e.g. engine/brake system malfunction) is overlaid from a separate, isolated software system with a stack that meets quite high functional safety standards. That is, the chance of the second part of the system ever failing is comparable to winning the lottery.