Trying to replace a robertson with a hunter

I have a red .pink .white,dorange,blue and yellow not having any luck any suggestions

HUNTER,, big mistake,JUNK, get you a Honeywell

If you didn`t tag/lable the wires as you removed from old tstat you in trouble again, like red to r, white to w,pink to?, orange to?? most tstat wiring doesn`t have pink