I wouldn't use the Cig lighter or any other circuit that is close to maximum draw limits.
Go to the ignition harness and tap the Primary Ignition wire or 12 volt constant. Use a fuse, relay and a switch. The relay will protect the switch so that it doesn't get burned out.
Wire the relay as follows:
pin 85 - Primary Ignition or 12 volt
Pin 86 - to Toggle switch
pin 30 - 12 volt constant (Place the fuse on this wire)
pin 87 - 12 volt feed wire to neons
pin 87a - Not used
The other wire from your switch goes to ground.
Wired this way the switch is isolated and very low ground current is passing through the switch, this will prolong the life of it.
92 Bonneville SSEi - Stock - Remaining repairs needed due to neglect by previous owner - ABS/Trac, AC.
Mods so far: Maganflow High flow Cat, Rebuilt */C
Future Mods: Interior swap for Leath, High Output Altenator, Crazy system, Climate Control swap & Custom Exhaust/Intake.
98 Dodge Stratus - Wifes Daily Driver
92 Dodge Shadow - My Winter Beater