Hi Bhumi,
The gauge needles use "smart shape" technology, which is very similar to MS Visio shapes. This allows you actually define your own shapes and use them instead of the predefined ones. You can learn more about Nevron smart shapes here:
http://helpdotnetvision.nevron.com/Presentation_SmartShapes_Smart_Shapes_Overview.html
Best Regards,Nevron Support Team