Ok. I think I can see what you have got and what you want/need.

On the Cossie 4x4 loom, there should be 2 relays. 1 for the ECU power and one for the fuel pump relay. The ECU power relay should have a black wire to it which is an ignition live feed. This switches on the relay to supply the entire engine management system with power.

This black wire feeds the ignition coil, ignition module and also the lambda sensor (if fitted) as well as triggering the EMS relay.

This wire is NOT big enough to run the EMS on it's own which is why it has to trigger a relay which then supplies the EMS with power. If you try and run the EMS on this wire, you will either set fire to your loom or melt your engine or both!!