Too many gauges on your page, feels like Woodstock with all them colors around? Then choose sector-based color representation of the displayed value. It means color will stay green for all values below 33%, yellow from 34% up until 66%. Take it over 67% and your gauge will glow red. These three are the default colors.

You can also define your own set of any number of colors, and thus get same number of color-coded sectors. Sweet.