Recommend a source to refurbish dash harness?

Don't get caught up in the spaghetti.

Just work on one color/wire at a time. If you follow your wiring diagram and take your time it will be fine. I'm an electrician by trade and I know when your looking at a bunch of wires going everywhere it can be intimidating. One color/wire at a time always helps me to be calm and not get overwhelmed.

So you remove a terminal from the plug, replace the wire and the terminal, insert it back into the plastic "plug", then start on another wire.

You can do it.

As long as your not color blind. :D