ReadonlycolorFill colour for this zone arc.
ReadonlyfromStart of this zone (inclusive), in the same unit as min / max.
Optional ReadonlylabelOptional label for this zone (e.g. "Safe", "Warning", "Danger").
ReadonlytoEnd of this zone (exclusive), in the same unit as min / max.
Describes a single zone on the gauge face.
Zones are rendered as coloured arcs or regions behind the needle / indicator so the user can see at a glance whether the value is within a safe, warning, or danger range.
Example