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...