Dash and turn signal issues
What you have there is an abortion. Without knowing "what was done" that is, what harnesses were used, and whether it EVER worked with that late model column, all you can do is dig in and try and fix it
What do you have for shop manuals? Download free ones here and an MyMopar:
http://www.forabodiesonly.com/mopar/showthread.php?p=1970088617
http://www.mymopar.com/index.php?pid=31
You might look at the 68/ 69 manuals and the 72 manual. You'll have to look at the column wiring for the 72 and see if you can make sense between those diagrams and the 68/9 "rest of the car."
Basically all column switches work the same...........
You have power going to the signal flasher and that feeds TO the column
You have switched brake light power going TO the column
In the case of the 70 and later colums, the emergency flasher switch became part of the signal switch in the column. So power goes to the separate emergency flasher and then TO the column
Make certain the emergency flasher switch is off
Brake light power goes to BOTH rear lamps with the signal switch in center position.
Turn signal flasher power is routed to left or right rear depending on lever position.
If you have a meter and test lamp, and get some clip leads (Radio Shack) we might be able to step you through some tests.
You can access part of "it" as the wiring comes out of the column, and the rear harness connector to the tail harness in the left kick panel.
The dash lamps may be a separate problem. I would be pulling the cluster to inspect and fix the cluster problems. You might be in for an interesting ride.
I have no idea why I'm awake at 2 O'clock in the freekin morning!!