newbie needs led advice/know how

I'm creating my own sub enclosure and plan on fiberglassing it.  Part of the enclosure is going to include a piece of plexiglass with the word Challenger in it (I have a 2010 Challenger) and I'd like to back-light it with some red LED's.  Structurally, I have the design all set but I don't know where to start with the LED.

I do not want the LED to "flash" with the music, but I do only want it to come on when the amp (radio) is on.  Someone mentioned that I should be able to use the Remote On wire to get power to the LED, but I have no idea how to go about this.  Plus, I've read a lot of posts about needing resistors and I have no idea if that applies to me or not.  I found numerous listings of 12V LED's on ebaybut I'm not sure if that's what I need or not.

I'd really like someone to direct me on where to buy the lights (or at least what to look for) as well as some basic wiring installation instructions.  Thanks.

If you use 12 volt LEDs, you will not need a resistor.  The following is a diagram using the remote wire of a radio to trigger a relay to power multiple devices.  Connect the LEDs and the amplifier(s) remote wires to terminal 30 of the relay.

Connecting Additional Devices to the Remote Turn On Wire ( link)

Using a 30 amp SPDT relay, connect terminal #87 to constant 12 volts positive with a fuse rated to the sum of the additional accessories you've added and the components you need to turn on. (If you have two fans rated at 5 amps each and a neon light rated at 10 amps, you would use a 20 amp fuse plus 200 ma for each amplifier and processor.) Connect terminal #85 to ground, terminal #86 to the remote turn on wire from the head unit, and terminal #30 to each accessory with an appropriate fuse. A fuse (not shown) could also be used between the output of the relay (#30) and the remote turn on wire of the amplifiers and/or processors for extra precaution.

Excellent! Thank you for the information.  A couple of more quick questions:

1) Where do I get the relay?  Or maybe more accurate, what type (size, etc.) of relay do I need to do this?

2) I'm a little confused about the "plus 200 ma for each amplifier and processor" part.  The only things I plan on running off of this are my amplifier and the LED light.  What information would I need from those items to figure out what relay and fusing I would need?

Thanks again!

Yes the relay will be fine.