Connecting Air Fuel ratio gauge

[4ORGD]

hey guys iv got a autometer ultralite air fuel gauge and i was wondering if anyone could tell me where id hook the purple wire up to.theres only three wire black white purple.cheers

[Joker]

I would say oxy sensor...

google even told me that

[Guest boostin]

Pretty obvious isn't it....

And you need a working O2 sensor for the gauge to work. Ours is sitting flat on 0.3V, so gauge no worky.

[4ORGD]

someone told me you cant fit a air fuel gauge without a wide band o2 sensor

[Guest boostin]

How much did you pay for your A/F gauge? Was it new?

[Guest boostin]

 CUDDAS said:

& i probably should have spent some more coin & got a wideband (innovative-spelling) O2 gauge kit set up, as it (autometer) just sweeps when cruising & lets me know i'm rich on boost ect,

Isn't that what its supposed to do?? Your O2 is constantly swinging from lean to rich when cruising anyway, so the gauge will be following the sensor output.

[Guest boostin]

Accurate.

You need a wideband gauge for a wideband sensor though.

[4ORGD]

nope its not suppose to do that.its suppose to show u at idle all the way to redline if ur running rich or lean.you can wire it to your factory ecu o2 sensor but it wont be as accurate.im going to be wiring it into v1-v2 ecu in a 89 rs legacy.i bort the autometer gauge second hand.do wideband o2 sensors have to be wired into your ecu.or is it a seperate sensor that runs straight off the gauge?

[Guest boostin]

Factory ECU's don't connect to wideband sensors, so it will be dedicated for the gauge.

[Guest]

 boostin']

[quote name='CUDDAS said:

& i probably should have spent some more coin & got a wideband (innovative-spelling) O2 gauge kit set up, as it (autometer) just sweeps when cruising & lets me know i'm rich on boost ect,

/quote]

Isn't that what its supposed to do?? Your O2 is constantly swinging from lean to rich when cruising anyway, so the gauge will be following the sensor output.

If you have a narrow band sensor (most cars will as stock), the output will most likely give you 0.1v-1.1v out as a signal to the gauge. This doesn't give you a very high resolution like a 0-5v output from a wideband. This is why the gauge seems a little erratic, and is normal for this type of set up.

As long as the needle isn't hard up against one end of the gauge (especially leaner) all of the time you know you'll be around stoic (14-15 AFR). It should sit relatively central on a light footed cruise.