Was your Car a Column Shift ?
And it is a 1969 you are working on ? Floor Shift/ Auto/ Stick ?
When I started taking my 69 SS/RS apart with my Son's help, I saw a "Rat's Nest" under my Dash.
I thought it was time to go for one of those After Market Wiring Harnesses.
My Son took the Dash Carrier out before I saw how things came apart and, I used to enjoy a good Wire Harness Trouble Shooting project when I was a Mechanic back in the 70's - Before the Electronics in today's cars.
So I decided to Repair it myself.
Take Pictures and what you don't know, this is were you are you will get your answers, might take a while though or Surfing the Net for a Pic here and there.
I tried to find the Delco Packard "Double Crimp" Terminals and had no luck, so I repaired my old Harmonica Connector and other Wires, Added some of my own Circuits and made a few of my own.
Also I do have many of the Packard Style Flat Male/ Female that I got from eBay and a few Supply houses, NAPA does sell them and others.
Do you have the Wiring Diagrams and AIM ?
My own Firewall Disconnect Diagram - that was confusing sometimes as to what Diagram you are looking for and where the Wire goes into but out of on which side