Although a DC-DC PSU is a better option than an inverter for a lot of reasons.
That's something you'll have to fabricate yourself.the questions i have are:
what good visor monitors are there, i only see ones with rca not vga or such outputs
Either that or deal with lower-quality composite video signal.
Time for a trip through the FAQs. Link is in my signature.when i turn the car off, wont power to the computer instantly go away? so i need to shutdown (or put in hibernate) my computer before i turn the engine off?
There are DC-DC PSUs that have a startup/shutdown controller that handle this chore. It will allow the PC time to enter hibernation (or do a full shut down, if you prefer) before completely cutting power.