I mounted mine next to mirror. Just take the dome light out and tap into the Grey wire. And find a ground any ground will work. Then reinstall the dome light. The detector will come on when you start the car and go off when you remove the key. The only annoying thing is that is goes on and off twice before it shuts off, (because the power is the same as the dome light). But other than that it works great. Let me know if you need more info.I tried piggy backing off of the interior fuse panel (side of dash) but got no power. Any help would be appreciated.