dial/gauge: Multiple widgets displaying datastreams with the same data stream id causes rendering issues

[diehbria]

To reproduce, render two dial/gauge widgets (or more) that are displaying the same data stream.

On initial render, it will be correct. If you then refresh the screen, it will render in an incorrect state

Below is an example of an incorrect state (note that the yMax is greater than 1000, so the full dial and gauge are incorrect representations of the data).