I did test some new gauges, now at least most of them work. For some of them I don't even know what they mean.
My biggest hope was that the gauges were more accurate than what my "vehicle information display" shows. For example the "remaining fuel (percentage)" and "remaining distance left (kilometers)"
But unfortunately they're not. If it shows "0 kilometers left", there are still 7 liters in the fuel tank, which means I can easily drive another 100 kilometers.