Hello Zorce,
Hey I just got a 4.3" Megellan GPS for my Xciting 500 and had it hard wired and mounted right below the dc charger on the stiring column. Used the mount that came with the GPS, just put 3 screws in the base and attached the base right below the charger so the charger is still usable. Actually I had Best Buy do it, I am mechanically declined, would have probably shorted out the whole electrical system. The GPS is easily removed from the mount for thief protection. Cost $50. There is plenty of room to do the wiring after removing the Kymco name/charger plate, just splicing directly into the charger wiring. Just a thought for your Tom Tom. Good luck, stay safe.
Scooter65