O2 sensor question

[Bean]

see if your tomei sensor puts out a dummy (narrowband) signal that you can wire into the loom. Lots of aftermarket sensor can do this (innovate for example) - that is if your tomei is wideband - if it's narrowband anyway then just splice it into your original loom.

if above is possible fit your tomei sensor in place of the original as the place on top of the manifold was intended for the EGR system and AFR/lambda sensor don't like too much hit for prolonged time (bosch ones are rated around 700°C)