Splunk 6.3 allows you to set colors by ranges with a hard coded min and max setting that you can eval in your search (possibly else where too?), but it appears that if you are using a single value visualization with percentages that include the % sign, the coloring won't work properly (black background instead of green or red). In previous versions I've used
| fieldformat <field> = <field> . " %"
to get around the % sign changing a value to a string, but this doesn't work with this case.
How do you set panel specific color ranges for single value visualizations that contain a % sign in Splunk 6.3?