Removed the fuel sending unit today, cleaned it up, 3 fine wires in place.
The level gauge works fine but I don't get the LowLevel light in the instrument cluster (checked the light).

Saw a small resistance in the Sending Unit, could this be part of the "low level" light system?

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1980 300TD(euro non turbo): Eng: 617.912 /Tran:722.118
1985 300SD: Eng: 617.951/Tran: 722.416