And I'd reccomend to add the internally lighted one and get your sparky to
wire it up (and a report to give to your "guverment man" if required) so
that you have both lighting systems available on seperate switches.

Maybe even go to the trouble of having both systems for all the instruments
you want on a partial panel! Flicking a switch on final is so much easier
than fumbling in your flight bag for that tube of metal that holds four flat
batteries!

Hope this helps,
Peter