Since a few version the gauge has the theme option.
Create a theme in your themes.yaml
th_gauge_3:
label-badge-blue: "#55acee"
label-badge-green: "#9bc53d"
label-badge-yellow: "#fde74c"
label-badge-red: "#c3423f"
and define it in the gauge config.
theme: th_gauge_3
So you can use every color for the gauges.