Do you mean "not always lit"? - since that will be the situation with bernard's method (they will be un-lit when the light is on).Don't mind if the indicators are always lit.
Kind Regards, John
Hi John
Neons always on would be acceptable but the best outcome is neons only on when the lights are off.
Sorry if I was being unhelpful by trying to be helpful IYSWIM
Rgds
Richard