Alternatively, there is a temperature sending unit on the side of the water pump housing that is not being used. I wonder if I could run a wire from that to the second port on the wire harness on the body that receives the glow plug harness.

Or, I suppose I could just make a jumper wire so the one prong at the end of the W124 glow plug harness becomes two like the W126 harness had. No reason that wouldn't work, right? Probably a cheap alternative to replacing the sending unit and harness?

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1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Highly Optioned, 350,000+ Miles