In my old paper FCOM of the classic it shows the standby horizon with an approach mode selector (customer option) which was a three position switch with OFF, ILS, B/CRS as available options. In ILS mode it would show the GS and LOC pointer in front of the horizon ball and aircraft symbol. Not a FD, just a normal ILS cross pointer. And a LOC and G/S flag in case either of those did not work or receive. It worked solely off the No. 1 ILS receiver.