Thank you for your interest in RadGauge.
The arrow in ArrowGaugeIndicator is actually not a picture, it is a path. You can customize it by changing the ArrowBrush, ArrowTailRadius and ArrowThickness of the ArrowGaugeIndicator. You can find an example in our online documentation
I hope this information helps. Please let me know if I can assist you any further.
All the best,
the Telerik team
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