Thought I'd post this before I forget. I am battling an algae problem in my 240D where black crap keeps gunking up the sender. I've had the sender apart about 5 times now and I was not gentle enough the last time and broke both solder connections of the fine (resistance) wire a few weeks ago.. I thought it's nichrome wire which I don't think can be soldered but gave it a try anyway and it took. I spliced in a piece of regular wire (single strand of a stranded wire) to lengthen the now too short resistance wire and it worked!.

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked