not sure what you mean Daffid? Are you changing to a standalone ECU? What is it you are trying to achieve? The coil pack is just a set of 4 built in coils, controlled by the ECU. The ECU will have driver circuits for them, basically switching circuits which are on the low tension side of the coils. The cable feeding the coilpack connects the low tension side of each coil to a driver circuit in the ECU. If you are doing away with the standard ECU but retaining the coil pack, your standalone ECU (assuming you have one) will then need to drive the low tension side of the coils and you would need to splice into the cabling for this or use an adapter.
Alternatively and in any case, you could also do away with coil on plug entirely and use a coilpack which has HT outputs, then run HT Leads to the spark plugs. This may be a better option as then you can match the coilpack to whatever is driving it - the coilpack can be damaged if not matched to the driver circuits properly.
More information on what you are trying to do would help. Also it may be better to have this in its own thread too.
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