Just finished my dash harness like you described. I took it one step further and disassembled each wire from the connectors and used a small wire wheel on my Dremel to clean each brass connector. I then took each copper light contact (little rivet type) for each light bulb socket and put in a solution (vinegar and salt) to take any corrosion off. I used lacquer thinner to clean the surface of the wires.
If you want to get the brass tabs out of the plastic retainer clips, just slide a small screw driver inside the clip a pull lightly to remove. You shouldn't have to pull hard if you depress the tab that holds it in the plastic clip. You will have to bend up on the brass retaining flange before you re-insert it or it wont stay in the plastic clip.
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