you don't need the sensor in the tube. you can just leave it hangin in there and nothing happens.
here's the vehicle application list for that part number in the K&N site:
2005 CHEVROLET MONTE CARLO 3.8L V6 F/I - All - K&N Air Filter & Intake Products
so it should fit.
I hate it when someone says it, but I'll say it now: you should've just googled it![]()