I purchased Aveo LED aviation lights for the wing tips. They provide strobe and navigation light functions. The setup is brighter, lighter, and more efficient than the conventional incandescent packages. I installed the wiring in the TE spar prior to covering.
I also purchased a lift reserve indicator (LRI) system. Similar to a pitot system, there is a probe mounted on the wing that measures differential air pressure and two air lines which run to an analog gauge in the cockpit. Based on wing angle of attack, the LRI displays how much lift the wing is generating and what is available for you to use at any given time. It becomes very useful in optimizing short field take-offs and landings. Check out at: http://www.liftreserve.com/. The owner was very helpful on followup technical assistance related to installation.
I installed the probe onto the right wing, prior to covering. The probe is mounted on the underside of the wing near the tip (to prevent air disturbance, such as from struts) and a distance of 15% to 30% of the wing chord aft of the LE. The probe pivots and is angled 50 degrees forward. A sheet metal spanner had to be fabricated and mounted between ribs to provide a stable platform for the LRI probe. The probe was then mounted on an aircraft inspection port and the port/probe assembly screwed to the spanner.
The wings are now complete and ready for covering.