Hey Gang:
Had to laugh the other day when I read the comment “looks like a grenade went off in a spaghetti factory.” Did you mean something like this?
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The only wires that make sense are the original steering column connector colors. After that it goes down hill quickly. Luckily, everything was working before I took it apart to make the new dash, so I am able to photo, mark, re-mark and label every thing. I’ve checked wiring diagrams from original MGs, VWs, Chevettes, Pintos, with no luck.
Maybe the wiring is based on a ’52 Hudson Hornet? 
Ringo