Navigation 1998 740IL

Just joined the site and purchased a nice 740IL 1998 with Navigation w/o TV Tuner. I would like to know if it's possible to install a mobile DVD system with built in TV Tuner and run it through the 4:3 existing monitor. If so what do I need to do or go and for what price....thanks!
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Here is a German web site to answer some questions.

Select the translate button on the top of the page.

http://www.car-amp.de/

Later,

Also, go to http://www.bmwnav.com. They have all the infomation on the BMW Nav systems.

Joe