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I'm replacing a 2 gang 1 way dimmer with a 2 gang 1 way dimmer and on/off switch but not sure how this would wire. I have 4 wires going into the old dimmer ,2 comms and 2 L1 but the new dimmer has 5 terminals with 3 terminals in the dimmer module and 2 in the smart switch can anyone enlighten me...