vac lines

need a little help. have 72 ac dart swinger. the two vacc lines that come out of the dash, one goes to the cut off switch on the coolent, the other goes to the vacc bottle on the fender. one has a white line down the side broken like this// ========

the other is solid black. WHICH ONE GOES ON WHICH ITEM. ALSO ON THE VACC BOTTLE, WHICH LINE DOES IT GO TO, THE TOP OR THE BOTTOM. TKS