color property

Specifies the color of the tail.

Defaults to null.

Widget build(BuildContext context) {
   return Container(
       child: SfRadialGauge(
         axes:<RadialAxis>[RadialAxis
         ( pointers: <GaugePointer>[
            NeedlePointer( tailStyle:
                TailStyle(color: Colors.lightBlue, width: 10, length: 0.1)
          )])]
       ));
}