Thanks for that Scott! Much appreciated. I did see that link earlier in my searches but couldnt find the exact answer I was looking for.
For future reference this is the distributor:
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Four wire plug, green, red, white and yellow coloured wires. So the red wire goes down to the 4 tooth wheel, which will be trigger 1. Green to the single tooth wheel at the top, trigger 2. White wire splits in to 3 and goes to each sensor (they look yellow inside the distributor), so I assume this is the sensor ground? and Yellow is unused?