You will need to override the OnPaint method and add additional drawing commands using GDI+. For example, to make and extended version of the gage, create a new class as such:
Public Class CompactGageEx
Inherits GaugeCompact
Protected Overrides Sub OnPaint(e As PaintEventArgs)
MyBase.OnPaint(e)
e.Graphics.DrawArc(Pens.White, 1, 1, 10, 100, 0, 50)
e.Graphics.DrawLine(Pens.Violet, 0, 0, Me.Width, Me.Height)
End Sub
End Class