I don’t fully understand what you mean, there is only one HSI and there should only be one CRS selector (to move the HSI) on the respective side, you could display two bearing pointers which simply point towards the station. You can select what those are coupled to NAV (VOR), ADF (NDB) or GPS/FMS, number 1 needle is usually thin while the number 2 needle is thicker. When selecting an ILS frequency it automatically sets the Final Approach Track (FAT) so the CRS selector becomes useless.