Help with reverse lights...

so the harness from the 3 pin switch has a wire that go to the starter relay, and a pair of wires that go to a plug, and that pair of wires goes to my bulk head in the engine compartment. Inside though, there aren't any wires that go to the holes where the wires go to on the engine bay. I located a L shaped plug in the under dash harness that has a white and a violet pair of wires. According to the manual, the violet goes to the reverse lamps.

69 is not supposed to have a reverse lamp switch on the column, its all supposed to be taken care of through the NSS in the trans. What am I missing?