i have recently purchased a wideband gauge and sensor... in the instructions it says to mount the sensor before the cat(s) for a more accurated reading... but i only have one sensor, and i have 2 cats before the Y. Please help... do i only run one sensor comming from one exhaust mannifold, or do i put the sensor after the Y, Which would be after the cats, but it would get both exhaust manifolds??? PLEASE HELP...
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You have to weld in a Bung for the wideband sensor.

Here's a pic of mine. I had a bung welded in a few inches behind the front sensor and then swapped them around. Put the front sensor into the new bung and the wideband into the original bung.

 

and incase your not sure what an o2 bung is.

 

ok i know what a bung is but where do i mount the wideband o2 sensor

 

Driver's side

 

you mean behind the drivers side manifold... why the drivers side???

 

#7 cylinder will go lean first. it's the most accurate side to read from. You want it after just a few inches away from the Front o2 sensor that is already there.

 

thanks guys... more than helpful...