If someone could please help me, I'd really appreciate it...I've got my heater box in, but the wires are not connected...if someone could please look at the pictures and just tell me what wires need to go where....

#1-This piece comes with #2 already plugged into it, but I think it needs to pluf into my old AC/Heater plug, but what do i do with #2?

#3 came off of my old AC Box...do i need that for this box?
#4- Yellow, Blue and Orane wires...do i need to soldier these to the wires (yellow, blue and Orange) that run into the firewall? I'm guessing i do.
#6 These 3 wires run back into the firewall, i think these need to be connected with the 3 wires from the box that are the same color

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