The parking brake one is the easiest. Unless Kenwood has changed it, it just wants a ground. Ground it to any fastener in sheet metal or tie into the radio ground wire.

The reverse lights on a pre LCI might not be PWM like the later models so you might be okay tapping into those. Later models it's a problem. Hopefully someone with an early model will chime in to confirm.

The VSS should be unnecessary but I haven't installed a Kenwood nav setup (do they still use Garmin?) in a long time. I think I'd try the install without it and then revisit if need be.

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2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)

2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)