Custom Rocker Switch On/Off Blue This Switch Turns Something On [5359-A38] by 50 Caliber Racing

I understand they are illuminated, but are the backlit/illuminated when off? so can find them easily in the dark

Is there anyway to get custom made switches for a semi truck?

this be used as an ignition switch

I only want the back light lite when the rocker switch is turned on is this possiable or does it stay lite all the time with power to it