This is a modified version of the RangeFinder gadget that is supplied as part of the baseline Gadgets.
It is cut down a fair bit, so that it only displays the range to the selected target, but it is configurable as to which target you want the range to
Target
Target.Target
Focus
Focus.Target
Group01 - Group20
Can specify fontcolor/fontsize for each seperate gadget.
Has an option to override selected color if distance > 50m (will go red). This is useful for seeing if people are out of range of guild res. perk
Thanks to Wildtide for Gadgets, and for allowing me to post this derivative work of one of his gadgets.