I must be missing something. I have a Cerbo GX that i am trying to install digital sensors for the bilge alarm, and a possible door or two. But the input on the device shows only the data input, and the ground connectors. All the sensors i am finding show a power connector as well, making them 3 connections, red, yellow and black. Am I looking for the right kind of sensors? Is there a specific type of input device I should be looking for?