I got a pair of 12" cathodes from Oznium and I'm not sure how to install them. Should I power them through a separate source or the battery? If the battery, how would I go about wiring them up?

same as standard neons,

use a fuse and wire them either to an existing 12v constant source or run em directly from your battery, its up to you.

You mean I could hook them up to the fuse box?

no, get a fuyse from autozone or sumthin

wire em off the light in the cubby. Then they come on when it gets dark.

thats what i have mine run through...mine came with a little black pouch...works great

id go off the battery, becasue if you ever have warranty work and they see wires cut, they'll find a way to blame it on you

For real?? :|

I've got tonnes of poop running off of there, lets hope nothing goes. :P

lol im lucky my warranty has run out! boo ya!

even if so, your still better off sfety wise running it directly to your battery.