Help wiring TV tuner for ipod

Hi, I have had some questions about this before but was a little phased by the electrics, so whilst car was booked in a local garage for the cam belt change asked them to connect the TV tuner and route the wiring into the arm rest where the phone is.

Sounds simple eh.........nope, they had no clue without pulling the car apart (which I asked them not to do @£75 per hour). So has anyone got a 'how to' on this?

The details are - have RNS-D (navplus) but no TV tuner as std so have one I got from A8 parts. Do have the 6cd changer though and phone in the cradle etc.

So I need to know how to a) connect TV tuner, b) connect Ipod to TV tuner and route connections to arm rest? (plus a clue how to turn the 'in motion' button off and get a digital feed would be considered very much the icing on the cake for me!!)...................car is going back in on Friday (another tread question!!! as I have another 'issue' to sort with it so was hoping to get them to do it then if I could give them a clue!)

As always thanks in advance for any help anyone can give!