Hello could u send me a pic of the way u did it please
Search 'GPS' and you'll see an early one of the result, although it looks much cleaner and more elegant now.
Top Pocket
1. Unscrew the 2 screws under the rubber mat and remove the panel.
2. Come back to this when the rest is done.
GPS Cable
1. Put your original existing car adapter cable away in the box and make a new one from a cheap micro-USB cable and USB adapter ($5 at Cheap As Chips or Reject Shop).
2. At the power end of your cable cut off the standard USB head and feed the bare end down through the left screw hole of your top panel and through the corresponding threaded hole in the metalwork until you can reach it from below.
3. Pull away the panel with the two power (cigarette lighter) sockets and solder the bare +5V and GND ends of your cable to the corresponding pins in your USB adapter circuit.
4. Solder the +12V and GND pins from your circuit to the corresponding points behind the left power socket on the panel.
5. Reassemble everything, using one screw in the right hole of the top panel only.
GPS Bracket (what I did anyway)
1. Put your suction bracket back in the box next to your original cable.
2. Using a piece of coathanger wire and a pair or two of pliers, fashion a low profile bracket that will situate the GPS at the right height and hanging from the gap behind the lid latch.