Good thing we weren't taking bets, it is not a neutral safety switch for a '65.
Got back to the Skylark and looked. Switch for an automatic has 4 male contacts. Two are for the neutral safety switch and the other two are for reverse lights.
But, a 3 spd manual, column shift car has a two prong switch that attaches on the column.
This can be seen in the '65 chassis manual,wiring diagrams section, page 10-92. Better picture of it on page 10-47 figure10-50.
As for the 4 spd switch, there is a picture of it's mounting on the transmission side cover . That is also page 10-47, figure 10-51
Loren