Just to update, I sourced a 2nd hand ECU and plugged in this morning and it fired straight up, despite AC tronics testing the original ECU as being ok.
Still not sure why pins 40 & 41 have been spliced into pin 37 but it runs.
Thanks for the help.
Message Thread 
BMW E30 325 1990 - Wiring diagram for injectors - Fixed # - Tony Lewis November 12, 2018, 6:18 pm
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