Console wiring
I'm surprised you have a switch on the shifter, do you have the single or three terminal (later model) Torquflite neutral/ backup switch?
The cars with single terminal NSS have the backup switch on the transmission (stick) the column shifter or the console shifter. I don't know if I have correct diagrams for 69, but the harness should be a combo of white/ violet/ tracer, and lights. So two wires for the switch (backup if used) and orange for the shift indicator. More if you have a console tach.
This is '68, should be similar