Is it possible to hook gps up to a premo icc screen? I kno u can do a vga input so is it possible? If u do would u b able to hook another gps unit to it or would i have to go the car comp route? Also i have just hooked a sub & amp up to the icc what wire would anyone suggest to hook my remote amp input to? My multimeter broke and im lost trying to find a switching wire............