I have used Deutsch style plugs for all of the electrical connections. Th plugs are very easy to use and they are of a very high standard. (Computer quality). They are not the cheapest plug but they are water and dust proof and will not vibrate loose.
6 pin for the elevator trim 6 pin for the aileron trim 2 pin for the fuel gauge 8 pin for the strobe lights and landing lights (using the LED lights system 4 wires each) 4 pin for the rear position strobe