The OE wiring harness was in really bad shape. Finding a complete new harness from Peugeot was out, but luckily I was able to get some really good aerospace wire from an engineer friend. It's teflon coated, and good up to some super high temperatures. I didn't have enough wire to rebuild the complete harness, but was able to the parts that needed it most. Most of the wire behind the firewall (or what was left of it) was in pretty good condition, so no real need to replace it. In any case, some pictures of a few sub-harnesses below:
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