How i don't envy you mate,i'm going through a load of shiyte with my weber/Pectel ecu too...
I'll give you a few pointers that gave me grief when i first installed the weber inj system onto my non Ford engine,check the phase sensor connection carefully 'cos if it's got a L8 ecu and it's not making contact the mill won't fire.
Turn on the ignition and remove the connector from the phase sensor,and whilst turning over the engine does the fuel pump buzz and system relays click?.
When the sparks are present are they 1-4,2-3 at the plugs? or just a constant,noisy surge of current going to all 4 plugs?,mine did this and it was a loose 12+ feed to the ecu.
The grey tach wire form the wasted spark kit connected to pin 21 or 9 has no effect on the actual running of the engine.
Check the ignition relay is ok and not burnt,when you turn on the ignition have you got 12v at terminal 87 on the relay?.
The crank sensors are quite reliable but change it anyway.
I hope you sort it mate.., mine is really doing my head in