Here I show how to add "auto off" lights to your GS.
Also the invaluable battery tender power whip (SAE type connection) - also use to power my volt meter and USB power supply - I like this because I can isolate the volt meter and USB if need be. I usually leave connected at all times...
here you can see the volt meter LCD (for daylight visibility) and the USB scocket next to the light switch.
NAPA has these....