Console wiring
If you have the original console hrness the plug on it is the same as the one on the column mounted reverse lamp switch. Simply unplug one and plug the other in.
In 1970 the reverse lamp switch moved to the trans. The 2 wires were routed thrugh unused ports in the bulkhead connector and on to the trans.
If you have a 70 up trans with 3 post neutral safety switch go ahead and route the 2 wires to there. The shifter mounted switches are often worn out or broken and difficult to find in good used condition.