This is working as expected given you are using a mini-chart and linear gauge, you have to set the rest of the gauge properties via the Gauge Settings button, or you could also try the Background color setting for the mini-chart representation in that expression... You have only one segment configured on your gauge, and the color is green...
To help users find verified answers, please do not forget to use the "Accept as Solution" button on any post(s) that helped you resolve your problem or question. I now work a compressed schedule, Tuesday, Wednesday and Thursday, so those will be the days I will reply to any follow-up posts.
.png "Former Employee"){kind=icon}
