Animated SVG Gauges With JS: JustGage
It is built on top of Raphaël library for vector drawing, uses SVG, and it can scale-in-size perfectly.
The style of the gauges can be customized with colors (single or gradient), width-height and labels being on/off.
Also, it is possible to set min/max values, animation type on initial load and more.
Compatibility: All Major Browsers