You want my suggestion?
Ditch all that crap. Buy a new harness at the firewall. Board member Musclerodz sells them at his site:
http://www.musclerodz.com/
His name is Mike Redpath. You can call him at 405.735.8405 - I am sure he can help you get a new harness to cover everything from the bulkhead at the firewall and out.
My only reason for saying this is simple: The previous owner of your truck spaghetti'd the hell out of it. That truck looks like an electrical fire waiting to happen, and $50-$100 for a new harness from the firewall out is a small price to pay for safety.
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If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (
link)
I can't check the forum daily. If I don't reply to you within 24 hours,
drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.