I soldered 50cm long wires to the switches. Because quite a number of wires will dangle beneath the throttle quadrant when I am finished, it is essential that you bring structure in the colors you use and also document them. I use two colors for ground (left side black, right side red). The auto pilot disengage has yellow wires and the TO/GA has green wires.
And here you can see how the wires are put into the groove. You can also see the aluminum strips. The part of the groove that will stay visible has been filled. This can harden overnight and be sanded down tomorrow.