Does it move in steps, or does it move continuously? Would be funny if it’s the latter and a parking inspector comes and while they are looking at the dial it is slowly turning around on its own.

For that matter, even if it only moves in steps you could still be unlucky in several ways. For example if the parking inspector is looking at it at the same time as it makes a big leap forward in time.

If the area is subject to multiple inspections every day then the parking inspector might also notice that the same car is sitting in the same spot between multiple inspection rounds over many hours. No amount of technologically advanced timers will help the cheater then.

Perhaps someone could also invent car paint that changes colour every hour :p and then hope the parking inspector and everyone else are not looking the moment the colour changes.