Understanding the Emergency Flasher Switch
Post 9 has a better description/schematic I think. It is for a later car, but the terminals are numbered consistently. If the switch is physically removed, you need power 49, and tie 49a, L and R together as that is what the switch connects when activated. 49 energizes the turn signal relay to flash which in turn flashes voltage to 49a and through the switch sends the current to L and R out to the bulbs.