If you are looking for ends that seem to be hidden in looms and you're not sure where they go the only way I know is to get a multimeter and start performing continuity checks
I assume the wiring loom is still from the 280CE - as in original to the car - so if I were looking for the other end of the wiring for a tachometer on a petrol engined car I'd be off searching around where the alternator sits...
...I've got a feeling (wild guess alert!) that that's how "they" did it for petrol engine cars (not sure why they did it differently for the diesel come to think of it - I'm sure some electrickery genius will jump in and explain...
...another alternative to the alternator way might be via the CIS system that was once fitted where there probably a crank position sensor for the tachometer on the front pulley (that's where it is on my M102 / W201). There's another sensor on the flywheel too on my M102 and the wires all join up on the left hand side of the car near to where the ABS pump on a LHD car is fitted.
As you can tell I'm not up to speed om M110 + W123 engine configurations - hope the comments help enough for you to find the wires.
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