Excellent info there gaz, thanks for that. Having read through somw older posts regarding retro fitting nav systems I believe the setup came with custome wiring to allow it to easily be fitted plug n play for the older 99 systems but I'm just looking to do a strait swap with a newer looking setup that has nav function hence dont think it will be as simple as hooking up the radio and heater control wires and leaving the nav input alone. Therefore I think I'm just going to stick with the Jap info display. Although as it has a TV tuner, it may be able to take an input from another media source to allow me to use a digital TV recevier? It's going to be something I will start to look into...
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