It's now possible for these to have dimmed illumination in that comes on with your sidelights.
Then, if you press the switch to activate the accessory, the illumination changes to full brightness.
One per switch required.
Wired easiest with double pole switch contact block
but can be used with single pole block by piggy-backing to the switch +12v out terminal
Dim / Bright Wiring Kit for Billet Switches #BSWDIM