Specifies options for the gauge's needle(s).
A needle is used to indicate a current value in the gauge. If you need to indicate a single value, assign an object defining a needle to the needles configuration object. In the needle's object, specify the value to be indicated, and define the needle's appearance and location.
If you need to indicate several values on a scale, specify needles as an array of objects defining needles. If you need to set similar values to properties of several needles, use the commonNeedleSettings configuration object. It exposes the properties that can be specified for all needles at once. Note that the values specified for a needle individually (in the needles array) override the values that are specified for all needles (in the commonNeedleSettings object).
To define a needle individually, use the properties listed in the needles object. In addition, any property of the commonNeedleSettings configuration object can be added to the needle's individual definition. For example, even though a common type is specified in the commonNeedleSettings, an individual type can be specified for each needle.
Specifies the value that the current needle indicates.