I am working on my recently bought 1984 merc 120 (sn 6734358) on a alpha one. The trim sending unit and switch were both missing and all the wiring for the sender that I could see was gone. The wiring for one of them was still there but I don’t know what one. I have no idea where the order one goes. I do not see and loose wires or disconnected plugs. Any help locating where they go would be appreciated. The attached photo are the wires that were still there. I believe they are for the sending unit.