Not sure about the speed sensor but yes a few people have done installs with the factory bose system. The wiring is in two places one for the sub behind the seats and I am not sure were the other is as I have not done the install yet. I did make this to help for the wiring. Now you can also wiring into the pre outs coming out from the head unit before they go to the amp but when I did an accord install even after switching the tab on the jl for low input it did not sound right.
Who Wants Bose Wiring Diagrams!!