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The acc is just an accessory wire. Just use any wire that is only hot when your car is turned on. If you take out the back of your headunit, most of the time there's a yellow wire connected to it which is only hot when your cars on (you can always test with a voltmeter). You can just tap into that wire. As for your LCD question, I'm not real sure because I just bought a screen with touch-screen built with it.
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