Subscribe to download
Formation Flight

Formation flight made 'easy', just put an eye block on your plane, black on the leader, dark gray for the wingmen

If you want to change the default values or the block used for the tracking go to:
D:\Program Files (x86)\Steam\steamapps\workshop\content\585420\3318947366\main.lua
and edit the first few lines (it was a quick mod, i didn't bother to set that up)