I'd wire the neon to your fuse box. You could wire it in with just about anything, I.E.:
1. A constant- so when the car is on, the neon is on.
2. A constant, with an on/off switch, so you can have it on whenever your heart desires.
3. Your headlights or parking lights, so it's only on at night.
4. Just about anything.
That's what I would do.
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