Weird question about lighted rocker switches.

Use a relay
or a powered up bulb and ground it with the same rocker switch, so it simultaneously lites up when the switch is grounded.
I used separate remote LEDs for my set-up, and put them on the tach, so I always know when something is engaged. I use a green one for my line-loc when I use it as a hill-holder, and a red for my GVod. I have a second button run in parallel for the line-loc which is a momentary-on, and it too lites the green bulb. The line-loc power supply does not come from the ignition sw, so I can set the Line-loc ON, and go for supper. If someone attempts to steal the car, good luck driving it.

Bought those LEDS from Radio-Shack many years ago because they were 12 volt LEDs.