With wire...2. When I do hook the P1900 to a power source that is not in my car, how do I turn it on (since I will not have an ignition switch in my house)?
Seriously... Tap into a HDD power connection. The yellow wire is +12v, the red is +5v and the black ones are ground. the +12v and ground go to the carnetix, and another wire in the +12v pin with a switch that maintains on/off state runs to the IGN on the carnetix. The switch will simulate ignition.
Crimipng is acceptable, but soldered is a better connection.[I]3. When either testing or in the permanent install, is it safe to use either crimp on snap connectors, crimp on butt connectors or those of the like? Or must I solder everything to ensure the best connection.
First of all, I always recommend PS2 keyboard and mouse. You never need drivers and if USB craps out, you'll still be able to control the PC.I know this is alot to ask, but my last question is whether or not I need a powered USB Hub since all I will be using is the LCD Touch screen and GPS receiver. I may put in just a normal non powered hub for the occasional mouse or keyboard.
rather than a USB hub, I'd simply get USB extensions or extend USB headers using Cat5 cable. Why have a bulky hub whne it's not really needed? The Pandora has at least 6 USB ports, so you're not going to be hurting for ports unless you start adding all sorts of USB bling to the setup.