[silnv]

1) I already had my whole dash out when I did mine so it was easy for me. Coming from the ecu is like 12 wires right up in the dash there is a plug just unhook it there --- you will eventually need to splice a diffrent plug on there so it will work correctly.

2)IIRC. you use your factory harness still for those I believe the wires for those come out of the black fuse box on the passanger side. AC needs to be rewired look at the faqs on heavy throttle.

3)KA tranny wiring will work just make sure to change your sr speed sensor in the back of the tranny to the ka one.