Daaaang. Some people just should not touch controls.

I would seriously look into finding a replacement wiring harness.
Or invest in a good soldering iron, heat shrink, and a heat gun.

Engine bay harness between a 300D and 300TD should be identical.
Dashboard harness should be almost the same.
I wonder if they made the wagon-specific items on a different body harness.

__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech