Blending Options>Gradient Overlay
Gradient’s parameters:
Take the
Ellipse Tool (U) again to represent a flare on the indicator’s surface, correcting its shape and marking out the necessary top, applying the
Convert Point Tool.
Choose next the
Free Transform option to place the flare on the upper part.
The layer’s parameters:
Fill 20% on the layers.
Blending Options>Gradient Overlay
Gradient’s parameters: 
