Did you try to use another type of gauge among the WinCC objects to see whether this is a general issue or it is only related to this single object? (The gauge and clock are of the object types that WinCC could not initialize them properly sometimes in the Run Time mode).
Another solution could be related to the version of your Framework; dotNET framework version 4.7 is not compatible with TIA Portal V14 nor V14 SP1. So please first check the version of your TIA Portal. If you are using TIA Portal V14, then you will have the following solutions:
1) Install the update for the WinCC Runtime from here: https://sie.ag/2VESqw1
2) Downgrade your Framework version to 4.6.2.
3) In the end, if none of the above solutions work, in some cases re-installing your WinCC could solve these type of problems.
Hope these solutions work for you. Please let us know whether you could solve it or not.