question did you guys run your wire through the passanger side of the car or did you put a hole in the firewall?
for the sensor itself there is a grommet in or beside the driveline tunnel that sits below the
dash assembly/shifter console. It is about at the end of your downpipe. It leads up inside the console for a hidden install.
The easy grommet to the motor compartment is way off to the side of the car on the passenger side. it is a little difficult to get to. about top of the glove box high and against the side of the body. I use it for pressure, boost gauge, but I don't know why you would use it for a wideband install.
btw, a regular old fashion muffler shop almost did it for free for me, but I gave the guy some money for the effort. (go in when the shop big wigs are not there)