This request concerns adding a new control called RadGauge to RadControls for WinForms. Similar controls for Silverlight can be observed at this link - http://demos.telerik.com/silverlight/#Gauge/Gallery/LinearScale
We introduced new control RadRadialgauge in Q3 2014 (version 2014.3.1021). We are planning to introduce RadLinearGauge in Q3 2014 SP1. You can refer to Release notes: http://www.telerik.com/support/whats-new/winforms/release-history