What kind of visualization you use on those 5 panels? Do all 5 panels use totally different search? If your panel searches are written in a ways that they can be merged into one query, then you can use post-process on your dashboard to populate your health panel and other 5 panels from that merged query result.
I've a thresholds for all the 5 panels which turns the panel to green/orange/red color. If all the panels are in red, then health should be in red , otherwise it's green/orange. SO how can i add dependancy like this?.