The shrink tubing is not just for looks. It is far superior to electrical tape, insluates the connection from other leads and from other metal in the fuselage, and, yes, it looks much better.

Use a size that is about twice the diameter of the wire junction you are working with, cut it at least a quarter inch beyond each bare wire end, then shrink it with a covering blower. Then when all three wires are done, put them together and put a larger piece of shrink over all three, again about a quarter inch beyond each end of the previously shrink-tube covered section, then shrink it down.

It will both look better, add strength, and protect it from any intrusions or short circuits.