This has been requested since at least LabVIEW 5:
http://digital.ni.com/public.nsf/allkb/682E59F06E441751862567EC0021CFC5
Apparently the only current option is to use the lines in the decoration palette:
https://forums.ni.com/t5/Example-Code/Customizing-the-Gauge-Control-in-LabVIEW/ta-p/3533688#comment-...
So many other things are customizable about controls! This should be one of them!
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.