I've seen this (changing components from one year to another)so many times, I wish I had a $100 bill so I could retire! I have one guy in Switzerland that has a 68 tach dash, but a 67 non-tach harness that has been butchered with a 68 ignition switch, burned wires, and nothing works. Does anyone really wonder why? Although Mustang wiring is not rocket science, it seems very few know how to put things in working order, let alone changing components from one year to another. For $175, I refurbish your harness to OEM specifications, plus give you a 2 year warranty, no questions asked (even if you burn it up!). Ask around and see if anyone in any electrical business offers any warranties.
http://midlife66.com/harnesses/welcome.html for more details and information.
http://midlife66.com/harnesses/welcome.html for more details and information.