where is neutral safety switch

I trued to tell you there isn't one. 2 of those wires enter the cabin through the far right member of bulkhead. The brown wire is continuous all the way to the starter relay.
It just 3 wires taped together from below wiper motor going down and not even taped from there up.
There should be a wiring diagram showing which ports of the bulkhead were used. You could crawl under the dash and see where the purple and white are placed.