Setting the A/F ratio?

[alundra]

Ok! Thanks sideways
But I don't know why?
So added oil gauges are false too?
I don't know the term in electronic in english but the A/F meter was fitted "en parallèle" not "en série".
That means it can't perturb the reading of ECU of the lambda.
So video is useless.

P.S: Finally if I understood! Be reading some stuff on net narrow sensor is useless for monitoring! Perhaps i run stoechio or lean and i don't see it!!! Sorry guys i misundertood you, to be clear adding gauge on a narrow sensor only show you that your ECU adding or not some fuel, but you can't see if the mix after it is stoechio or not.

Wideband sensor + gauge for reading it is very expensive!

Can a wideband sensor can be fit on a narrow sensor gauge?

So SAFC without wideband is useless...

Back from the start of topic: Anyone have a gauge for detonation monitoring on our car?