Wiring LED Glow lights to a 2005 ford 500?

I'm wanting to put in purple LED glow into my mom's 2005 Ford 500 Limited Edition. Here is the kit that I want:
http://www.ledunderbody.com/purple-expandable-smd-led-interior-lighting-kit.aspx
I'm wanting to wire it up so that it only turns on when the dome light turns on. Is there a dome light fuse I can use to give it power? Or will I need to splice into the dome light wire right from the wire harness? If there's a fuse I can get into then I could use the expandable circuit which would be the easiest.

Splice it into the 12v wire that powers the dome light. You might have to use a larger fuse if it blows the one there. Remember you are using the switch that turns the dome light on and off so your splice has to be on the dome light side of that switch.