Here's the instructions for the Zt2
http://www.zeitronix.com/installatio...structions.pdf
See this too.
http://www.zeitronix.com/questions/Zt-2questions.htm
Wiring can be as little as two wires.
As for getting the cables/wiring into the car, here are two ways to do it.
1. Through the same grommet for the o2 sensor by the CAT.
2. Through the firewall.
Pull off your driver's side wheel, remove the black inner wheel well plastics, and route the wiring through the existing grommet there. Personally, I have so much wiring on my Max, I chose to drill a new large hole right next to the grommet I just described and ran my wires through it (with a new grommet of course).
On a side note, do you know if your Zt2 was manufactured after Sept 1, 2006? I hope so, as it will have linear wideband output. See here.
http://www.zeitronix.com/Products/zt...bandoutput.htm