83Zel944! Highest marks for your measurements...A+++. I forgot to suggest one more resistance measurements between pin 14 & 15 at DME and one pin at the injectors those with grey (gr) insulation and those with grey/black (gr/bk) insulation, following the circuit diagram from MikeStewart. Could they possibly be broken as you never get grounding pulses to the injectors or are pin 14 and/or 15 broken in DME or in the 35 pin plug? I would check them just to be sure.
And I would definately put in a brand new DME relay as the old one probably has bad contacts in it.......in this case the one that supply current to injectors for a change (not the fuel pump). If wires are OK, new DME relay in, and engine will not start, I bet it is the DME not grounding (pulses) your injectors at pin 14 & 15 as supposed to. Try to loan a working one to put in but check those pins in the 35 pin plug before you connect them. All the best wishes

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Lapponia