well, if you are installing them in your doors you will need a soddiering pen, or gun, and some sodder, small straight screw drivers to open switches. And well, I am not sure what voltage the LEDs in the cars are already. I have not installed mine yet, but figured I would share the good deal on these. If you want to isntall them other places then the doors, and switches it might get a little bit more complicated and you should probably ask in a different forum like the asthetics forum, they have tons of posts on LEDs.
