I was playing around trying to put color on wind meter (sometimes invisible in bright sky). I took it out as thought maybe it was causing an old problem I've been having of losing some function keys (some may remember that one - still occurs occasionally). Anyway tried to add color to it and ended up losing color in tracer (reverted to extra very bright white).
So researched again and I think this is correct.
I have config.cfg in correct folder I believe: C:\Program Files (x86)\Steam\steamapps\common\Perfect Golf\Config
And the autoexec.cfg has this in it