I installed a Sony XAV-AX5000 in my wife's Toyota. If you are using the same or similar unit connecting the handbrake cable on the wiring harness to ground, that will take care of that connection.
Check post #14 of this thread if you need to find the reverse signal wire:
http://986forum.com/forums/boxster-general-discussions/51283-does-anyone-know-vss-wire-02-bose.html
I agree with Cunningr - exercise caution in cutting the wiring harness. You never know when you or a later owner will want to update your work.
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2000 Arctic Silver/Black, Hard Top, On Board Computer
PNP Rear Speakers, HAES 6-Channel Amp, Avic Z140BH,
Painted Bumperettes, 2004 (OEM) Top, Homelink integrated in dash with Targa switch, 997 Shifter, Carrera Gauge Cluster with silver gauge faces, heated 997 adaptive sports seats, Litronics, silver console
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