Air/fuel Meter

[chuckie]

G`Day guy`s & girl`s ,ok Air fuel meter is it best to run off seperate O2 sensor,or just hook up to the one all ready in car ?,as i did put another fitting in dump pipe so i could put 2nd one in to run the METER ,some say why bother & it`s only BLING ,so please enlighten me ,cheer`s chuckie.

[QWK32]

the reason its a waste of time is the fact that the standard O2 sensor is a narrow band sensor. it only has a small resolution 0-1v. if you search google for narrowband sensor you'll see some graphing of the voltage output/AFR reading. its not very accurate but enough for the stock ecu to get a sample.

what you need to get is a wideband O2 sensor setup. these work on a higher resolution 0-5v and give you an accurate AFR reading. these are a completely different type of O2 sensor and alot more expensive. i picked myself up a basic tech edge wideband setup for about $350.

now to answer your question, you can run it off the standard O2 sensor just by splicing it into the O2 signal wire at the ecu. no need to install another sensor, its just a waste of money. just remember the only real reading you will get from it is that if your running rich or lean, but not by how much.

[iz32]

where can you get a wide band sensor?

my car came with the air/fuel gauge already fitted to a standard second sensor and just like you said the needle erratically jumps from rich to lean according to whats happening but doesnt really give a "reading" as such. its pretty useless when you watch it.