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I have done this many times on other cars, mostly to install alarm systems. The easiest place to find switched power is usually at the fusebox. If you have a voltmeter, or just a cheap 12-volt test light from radio shack, you can find a fuse number that only supplies power when the key is on, usually the Ignition or Accessory fuses do this. If you can get to the back of the fusebox and solder your connections it will be cleaner looking than putting wires through the front where the fuses go in, and wires will stay put better. Try to attach any wires to the side of the fuse socket that does not have power if you take the fuse out, that way your devices will be protected by the fuse. Use strand wire that is not too thin. Depending on how much power you need, you might have to increase the fuse size but do that as little as possible or you risk damage to your wiring. Hope this helps.
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