wow

i think ur engine bay is due for a cleaning.....
and that sensor you're talking about is a coolant temp sensor...it has two 1/4 inch coolant lines going to it and it help to heat the car faster by knowing how cold it is outside... something along those lines anyways...
the O2 sensor is in the exhaust....
as far as that sensor....i just drilled a hole in the intake pipe and then secured the sensor with a self tapping screw. A litle silicone and it was air tight seal...
well built intake though.....did you have to remove something in order to get the filter down behind the bumper.... cause i have a canister of some sort where the perfect spot to feed the tube through is....
I made my intake out of 3 inch tubing and used a hydraulic Bender and then welded the brakets in place...the only thing a bought was the filter and the silicone sleeve....
If anybody wants I can make them one for about $60