Thanks for all of the responses.
If this is the case, will the original screen work?
No, Dawilson123 suggestion should work, but your link refers to a Nav system which cannot be used as a display device for a video source like the Pi.
I really like Dawilson's screen for an environment where 12V or 220V is available. If you need a screen in an battery powered environment, you could also consider a $80 android tablet:
and connect it with Wifi to a Pi (would need some hacking on the Pi so that it acts like an access point) or USB (would require software hacking on both the Android device and Pi). You could use an SSH-client on the tablet to display text from the Pi or enter input or VNC for graphical output.
In above setup it is probably more practical to just forget about the Pi and use such a device which has a screen and ARM processor directly for your application.
What we really need is a dumb and cheap (touch) LCD screen with an USB connection and driver software for Linux. There is another thread about that subject, but such a device does not (yet) exist: