a 10 quid 2nd hand narrowband one lee, you get a feel for how it responds, and you can adjust the fuel pressure to verify how far lean or rich you are running to some degree.
here,s mine closed looping @ cruise, then off the scale rich when i boot it, then off the scale lean when i lift
[media=youtube]AxIKR5OjVcA[/media]
i would advise keeping your stock lambda connected to the ecu personally, and using the safc to trim the fueling
