Hotwire Wiring questions

These are great questions. I'm also running a Hotwire harness for the 6.4L engine management and NAG1 trans.

C) I actually wanted to run the factory push button ignition switch. Chris at Hotwire said that I could not use it because of the sensor system needed (factory key). He said to use a universal key switch.

D) I believe this wire is for the sensor on on the factory brake pedal. You do need this for the NAG1.

E) Possibly a reverse sensor. Again, I think this is a NAG1 thing.

I) I'm running an Autometer GPS speedo. I hope I don't need it.

The instructions suck for my harness but Chris has been helpful an responsive.