Single wire reverse light switch for 68 Barracuda

I know the reverse lights worked on the car with the current switch in the column. What I didn't realize is the car would probably start in gear without the neutral safety switch working ? I've already purchased a new harness for the single wire and assumed it wouldn't be too difficult to find?
It's just one wire that goes from the starter relay to the neutral safety switch, correct? You mentioned a switch with more than one terminal which is what I was concerned about.