Docs are slightly ahead (again)
Dynamic support for gauge was merged into the main branch - which has updated the docs. However, this is not yet released as there are some additional issues with the dynamic support for gauge that are being addressed here: 1180 UI Gauge bug fixes by gayanSandamal · Pull Request #1264 · FlowFuse/node-red-dashboard · GitHub before we push a new release.
I will look into our processes for how docs are updated and see if they cannot be separated from PRs (or some other means of process control that limits this step between merge and release)
Sorry for the inconvenience.