By default, Wijmo's radial gauges use a colored sector and a text element to
indicate the gauge's current value. This results in a clean and easy-to read look.
If you prefer a more traditional needle-style pointer, use the needleShape
and needleLength properties to select a needle pointer which can be styled
You can also use the needleElement property to use custom SVG elements as
needles, and createNeedleElement method to create custom needle shapes.