digital guard dawg with GPS and starter cutoff wiring question

[toadster]

I have the Digital Guard Dawg PBS-I system with the optional GPS/cutoff accessory

a few questions - on the main unit:

1. ACC2 where do I wire it? or is it a dead line?
2. accessory wire brown to brake switch+, where does purple line go? (switch to ground as you approach) <- is this just a ground wire?

on the GPS/accessory relay:

1. red wire to blue start wire - correct?
2. where does the relay blue wire connect to?

thanks!

dgd-wiring.png