You can also use a label maker like a Brothers http://www.ptouchdirect.com/ set on a small font and then use Lowell's method of clear shrink wrapping. More expensive than making them on the computer at home but may be handy if you are wiring out at your hangar and don't have a computer or printer available or you have to make a change to your wiring system.

Our sponsor SteinAir carries several sizes of the clear shrink tubing if you have trouble finding it locally.