The Extent pane determines the thickness and position of the scale. In a Radial gauge this position is measured from the center, and in a Linear gauge this position is measured from the bottom of the gauge.
Inner Start — Set this value to an integer from 0 to 100. This value determines the position of the start point of the inner rim of the scale.
Inner End — Set this value to an integer from 0 to 100. This value determines the position of the end point of the inner rim of the scale.
Outer — Set this value to an integer from 0 to 100. This value determines the distance from the measuring point to every point on the outer rim of the scale.