Buy the PAC Audio TR-7 Bypass off of ebay. It is a lot better then using the ebrake/foot brake method that Alpine requires you to use. As for the reverse wire, you don't need it unless you are hooking up a back-up camera, you do not drive in reverse enough for the GPS to even notice. One note on the TR-7, only hook-up the head unit wires to it, you can just ground the Navigation ebrake wire on that unit.
2007 Red Brawn LE 4x4.
AVIC-Z2 w/Bluetooth and XM NavTraffic, Pac SWI-PS, Alpine Type-R Sub w/ MRD-M605 AMP.
Remote Start/Alarm, Wheels, Rear Entertainment Screen(s) and Wood Dash Kit