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ok, so im gettin 4 white neons that are 15'' long each. they are going on my car obviously. anyway, it won't come with a transformer. will i need only one? how many volts should i get? 1500, 6k? does it matter?
1. neons,
2. transformer
3. wires
4. switch
anything else i need? thanx for the help!!!

 
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Neon transformers run anywhere between 5000-15000 volts. Varying sized transformers can be used, depending on how many tubes (feet) you chain in series, what the diameter of the glass is and how bright you want them to be. Generally, using the larger transformer than needed does makes neons brighter.

If you want to run 4 small transformers, the smallest ones you can find will probably be fine for those little tubes. If you run them all in series off of one transformer, you will have to run high voltage cables under the car between the tubes and insulate them VERY well.

I can't remember the type of voltage guides you want to follow per foot of tube, but any sign shop that deals in Neon can tell you all about it. (I used to be interested in neon as a kid).

Basically, neon tubes for cars are made in China now mostly and can be had for dirt cheap prices with transformers built right into the sealed tube. For probably 15 dollars or less apiece, you can get the automotive ones with built in transformer that just require low amperage 12vdc. That is your best bet, so you don't have to go rigging up some potentially dangerous HV system under your car that probably regularly gets wet.

Oh yes.. you'll also need a power relay and a good inline fuse.

Basically, use your switch to activate a power relay. Make the power relay have a strong 12vdc source (usually direct to battery w/inline fuse) and feed all 4 tubes from the one relay. Small neons are not particularly high draw items, so you could get away with just using a switch.. but personally, I always like to use relays. I hate making a physical, interior switch responsible for carrying sort of load. Just my preference. Good luck with your install, if you want anymore info, just ask.