Remove the interlock switch  and the nut plate .
Install the new interlock switch [A,B] with the (4) SHCS [K] and the nut plate [F].
Route the new cable  along the same path as the previous interlock cable.
Connect the cable in the same location.
Open and close the door. Make sure that the interlock key bracket does not interfere with the roof panel. Make sure the key nubs do not hit the switch face.
Close the doors. Turn on the spindle. Try to open the doors. Make sure the doors are locked. If the doors are not locked, repeat steps 7-10.