Fortunately my dealer also has the contract selling police cars to the state. They're experienced and they are certified. The work order reads installed by the dealership so no voiding warranty. I have a pair of hide-aways in the headlights and a pair in the rear (clear area of lens.) I couldn't find a place to put the power pack so I put (2) 2 head power packs inside the power packs. The 2 head power pack is solid state and sealed so its not affected by water, humidity, etc. I have them both wired to 1 switch to the left of the steering wheel. The switch is mounted in the blank switch area. They are whelen brand. I also bought an extra crosspiece for the roofrack and mounted a 6 strobe whelen mini edge which I wired to a cigar plug. I have a 10 amp inline fuse as the unit draws 9.6. On the dash I have a Deckblaster also wired to a cigar plug. No problems with power or blown fuses. Sounds like a bit much but we're 1 mile from NY City and when you're being buzzed by tractor trailers going 70+ mph in the rain or snow on the highway you want all the light you can get. I opted not to do the wigwags because they have to splice into existing wiring harnesses and that would void the warranty. By using hide-aways you're running a separate wire and its own fuse. If you want to e-mail me offline I'd be happy to talk more about it.