Have you tried using the shift L key to see if they light

If this does not work than there is a prolem in the light section of the aircraft.cfg file
You might be able to compare this with the default boeing 747 aircraft cfg file. to help spot the problem.
Also check the panel cfg file to make sure the gauge is spelled correct. I have found several cases where an "!" was omitted in the gauge line. as a result the gage either did not show up or it would not work.