Thermostat housing wires

Have just got my Sera 5E turbo, it has a 4E thermostat housing and ECU, but 5E wiring loom. The 5E stat housing only has two connectors, the 4E three, and with the third not connected the temp gauge is not working.

I am assuming the wire/wires go to empty pins on the ECU connectors as it was a straight swap, can anyone confirm this and let me know which pin it connects to?

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