You can change the background of the containing div by styling the div itself, which will fill the background around the gauges. There isn't an option that styles the gauges themselves, aside from what is provided for here: http://code.google.com/apis/chart/interactive/docs/gallery/gauge.html#Configuration_Options (none of which addresses the background color). If you are up to it, you might be able to use jQuery and the jQuery SVG plugin<http://plugins.jquery.com/project/svg>to dig in to the gauge's iframe, find the elements you want, and change their colors.
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