It would be nice to have different color schemes and also different layouts. For example how about a purely digital speedometer, analog-style, retro, etc… completely different views so you cannot get bored of it.
Have the ability to mimic other car brands even… I want the “Ferrari” gauges this week. next up… a Porsche style. You get the point.
Simulation of other companies’ gauges could be a legal/copyright problem, so that portion may not be possible.