I have the Interact V3 FX racing wheel. I know it's not the Concept 4 one but mine doesn't need an AC adapter it works plugged straight into the DC controller port - no power needed.
It does however have a 5 pin socket on the rear which is for the pedals.
I'm assuming the Concept 4 is similar but I may be wrong so if this doesn't help, my apologies.
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