Turbo headscratcher

[heckflosse]

No, nothing to do with lockdown hairstyles.
Having a bit of bother getting the 265 to start.
Its a LH2.4 system from a 92 240 /200F with ECUS and injector resistor pack from a 91 940 turbo 200FT. Engine was 230ET, all LH sensors swapped over, running inlet manifold and injectors from the LH 940.I believe powerstages are the same, this one is the 240 200F one.
Both donor vehicles were running ok before being broken up some time ago.

There is no spark on cranking from coil or at the plugs, and plugs are dry. Both Pumps buzz and by bridging the main relay there is fuel up at the rail.Pressure is not massive when the union is cracked open though. I havent got an LED test light here so cant see if there is a pulse at the injectors though there is a solid feed on both wires using a normal test light.Same for coil.
The resistor pack for the injectors was checked and I traced through the wiring on ECU pin numbers as per 200FT including using a relay.
Checked OBD codes and both positions show 111.
Manifold earths are good x2.
Strangely there is a spark on a plug when releasing cranking (if that makes sense). Flywheel is the dogdish one from the 200F, not a Motronic one.
I've ploughed through loads of the turbo forum stuff ,mostly American, but am not much wiser.
Ignition switch is 1979 265, would that really be different on a later vehicle as one post suggested?
Flywheel sensor is my favourite suspect as that determines both spark and fuel. There are three pins on it and resistance was about 180 ohms across two pins .No obvious decaying of the covering .
Any advice would be most welcome. Have I missed something daft?
Thanks, Jim