I used this:
http://www.adpmods.com/case-modding/...ed-p-1756.html
They also have blue, which is apparently just as eye friendly. My switches were recessed about 1/2" back from the main panel, so I just ran this tape along the angle over the switches. The tape is invisible to the occupants of the plane, but it lights all the switches nicely. A google search for "EL tape inverter" will provide numerous other vendors.
I was initially concerned that the inverter might make noise on the radios or intercom, but nope - totally quiet.
And at $6 for five feet, it sure beats the $100 AS&S wants to charge for the same tape.