E39 2001 525i

Background:
Car has TV
Widescreen Front Monitor
CD Changer

The car has no Navigation, it came stock from the factory like this and it seems to be fairly common on the Australian delivered 525i's

What i want to do is purchase a MK3 drive and either replace the existing analogue tv or somehow get both working at the same time

What do i need and how much is it all going to cost, what are the steps involved?

I head that there was some loom you could get that would basically link the tv to the navigation but the computer would still recognise it as two devices so i can have tv and navigation running at the same time.

Any help would be fantastic

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2007 E70 X5 3.0D Black/Beige - SOLD
2012 E70 X5 40D Silver/Black