To reproduce: the purpose is to have only one label with at a specific value. Hence, you try to adjust the start/end index of the labels and according to the labels count, you get the desired result. A similar approach is applicable for the ticks, but it hides all labels when you try to set a value for the LabelEndVisibleRange .
It is necessary to specify the exact range's values - start value and end value. The online documentation is incorrect. It should be updated. https://docs.telerik.com/devtools/winforms/gauges/lineargauge/elements/working-with-labels Current information in the article: "LabelStartVisibleRange: Indicates at which index the labels start. The LinarGauge control has a start and end value. The LabelStartVisibleRange value must be set within this range and the first label will be shown at this value. LabelEndVisibleRange: Indicates at which index the labels end. The LinarGauge control has a start and end value. The LabelEndVisibleRange value must be set within this range and the last label will be shown at this value." It is not the index, but the exact value.