Got some more work done this weekend. I guess we can call this "progress".
Got the dash out, and all the old wiring out of the interior and the old fuse box.
Got into it and the cluster and found out why they put the ****ty trio guages in there. Half of them are out of action (burnt on the boards). Combine that with the new harness not having the same connector, I pulled the trigger on a new cluster assembly that incorporates the tach. Went with the Dakota Digital VHX cluster kit. Also found the ignition switch was original, as well as the wiper switch. Since I'm in there.....
I forgot how expensive old things got quickly.