Yeah you want to connect your wall wart to the 5v pin and leave the vin pin disconnected.
Arduino 12v wall wart.
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The output is center tip positive 5 5mmx2 1mm connector.
I don t actually have an arduino nor have i ever used one my experience is with other mega168 based microcontroller boards so i m never really sure exactly what is brought out to headers and what the labels are.
These are switch mode power supplies which mean the output is regulated to 9v and the capable output current is much higher 1000ma.
Use google search box in upper right side of this page.
If it is 12vdc from the wall wart powering the neon device then you switch the 12v using a relay or possibly a logic level mosfet.
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Hey guys i am brand new to this arduino type stuff and am planning on buying an arduino uno tomorow.