I can understand your requirement.
However, it is important to keep in mind that the RadGauge is data visualization control. This means that it has no logic for restricting its indicators to the scales that are defined in its context. It visualizes the data that is provided, only. I am not aware of any demo project demonstrating the described functionality. If you can find where you have seen that behavior maybe I will be able to point you in the right direction.
On the other hand, in order to achieve your requirement you will need to implement custom logic for restricting the indicator at the maximum of the scale. You can take advantage of the IsAnimated
property of the indicator so that it will smoothly move the the assigned position when you change its Value
Please give this approach a try and let us know if you need any further assistance.
Pavel R. Pavlov