I am getting my k-series Seven mapped. It has an Emerald K6.

I am told that it will be better to run a wide band lambda sensor, if I want to get a fuel economy closed loop map.

Can someone indicate a kit?

Thanks in advance.

I use an Innovate but my car has an MBE ECU and its not permanently wired in.

Suggest you ask Emerald what works best with their ECU.