I just installed them into my car....wat kinda car do you drive?
To install them these are the 3 power sources that i recommend:
1 - cigarette lighter: also need a switch because continous power is fed to this even withte car turned off
2 - door lights: if you can find it tap into these to have them turn on when your doors are open...or the dome light is turned on.
3 - interior lights...this is how i did mine. I hooked it up to the temperature gauge light bulb and also to a switch. That way they turn on when i turn my headlights/interior lights on, but can be turned off at any time.