You can configure a marker’s Value to point to different values on the scale.
This allows the end user to interact with your gauge. The end user can drag the needle on your Radial gauge to point to a different value on the scale. The needle marker on your Radial gauge can be moved in the following way:
Automatically — You can configure the needle on your gauge to move automatically at specific time intervals and distances on the scale.
With Linear gauges, the marker can only move automatically.