Don't think you'll keep the car forever, so no need to replace the whole harness. Just repair the section(s) that are bad.

Even though my car is in very good condition, but I plan on keeping the car for 10 more years only. Why 10 yrs, bc I think every part in the engine bay will need to be replaced once again than, there is no way I'll be throwing money like that into a 37 yr old car.

So I just repaired the section that is next to the engine, which after 27 yrs have gotten hard/brittle/frayed/oxidized due to the heat from the engine.

Just get some wiring from the auto section (will last longer than 10yrs), lots of different size shrink tubing, new connector housings from the dealer (they are only 2-3$ each), I reused the silver electrical connector pins bc they are expensive ~$2 each.

1st pic is the section I want to repair.
2nd pic is the repaired section.

Attached Thumbnails

   

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85' 190E w/collector plates