Instrument Lights Not Working

UPDATE.

It's been a while, but I finally went "Dash Diving" again, and I've got (just about) all of my electrical problems solved. The biggest help was purchasing a used harness from another 66 Barracuda on ebay (best $35 I ever spent), and a wiring diagram.

I traced and re-traced all of the wires on the diagram, and then yanked out the dash and went to work. I scavenged the "new" harness and replaced 3 or 4 of the plugs on my harness. The main culprit was the "melted" headlight switch harness which had about 1 pound of electrical tape on it. I was able to re-wire the connection to the switch on the steering colum, and after attaching a loose wire to the WIPER SWITCH, and and adjusting the switch position on the column, I HAVE BACK UP LIGHTS!!!!. While I was screwing around, I re-wired all of the connections to the factory tach, and found that it STILL does not work, but I have since installed another tach sooooo..... The only electrical things NOT working right now are the radio and the factory tach. I don't know if the radio would even work if I hooked it up, but I do know there is no speaker for it. I'm thinking about installing an aftermarket radio, and speakers under the seats. That's just in case I get tired of listening to the dual exhausts..... Previously I re-wired the license plate light, it it is now working.

NOW I gotta figger out what's wrong with the neutral safety switch. Maybe I'll tackle that on Saturday.......Dang! I shoulda traced the switch wiring while I had the dash out.......Oh Well!