I located a replacement red cable and inductive pickup (about $85 total) and all of the electrical diagnostic stuff seems to work now. I haven't played with the exhaust analyzer portion yet. I think that will take a bit more tinkering to get it working.
I spent a few hours trying to locate an auto parts store that had the NGK plugs for a hemi in stock. (Since everyone on the site recommends them) I finally found 8 plugs this afternoon about 25 miles from the house. I picked them up (plus a set for the T/A too) and installed them.
I replaced all the plugs and she runs a lot smoother:
