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Thread: Air fuel mixture gauge

  1. #1

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    Air fuel mixture gauge

    Any one ever run one of these?
    I have read that the narrow band is a waste of money. How would one even run a wide band 02 sensor on a carbureted truck with no computer or throttle position sensor?

    I did hook up a narrow band gauge but it really only reads anything at speed or acceleration, if I let off the throttle there is no display and at idle it is a light show. I just ran it off of the stock 02 sensor.

  2. #2



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    Get an innovate wide band with the gauge - it will read the whole range - it has the electronics built into the gauge, and can be hooked into aftermarket computers like megasquirt and also some afetrmarket gauge systems.
    Pennyman1
    The best Dodge that Dodge never made
    Living the D-50 lifestyle since 1980

  3. #3

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    I built my own EGO meter from a kit, and on a carb application it is a useful diagnostic tool (one of the few electronics gadgets I have built from scratch that worked!). It will help you bullseye your idle mix, show where your best economy is found while driving and will also give you a warning of a potential fuel fault (suddenly running rich or lean or garbage fuel in the system).

  4. #4


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    Any wideband will do the job. You install it like any other... carby or FI. Most have analog output from the gauge processor that wire back into the factory wiring/ECU. This basically allows you to replace your factory O2 with a wideband without setting off the CEL since the wideband processor will output what the ECU would see.

    I just tossed one in my truck last month. Check out my build thread.

  5. #5

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    Geezer 101, that is exactly what I am aiming to do; just a little diagnostics.
    Merrill, do you have a link?

    BTW the new gauge is actually working okay. I just don't really trust it that much. It gives me a good reading driving down the road but the second I come to an idle nothing but some bouncing around.

  6. #6


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    A link to what?

  7. #7

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    The bouncing is normal. These things are super sensitive as they read variations in input voltage between 0.2 and 0.6 volts. The more it bounces, the closer you are to bullseyeing the mixture at idle. Remember there are all sorts of subtle fluctuations taking place with air/fuel and ignition.

  8. #8

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    Quote Originally Posted by Merrill View Post
    A link to what?
    your build thread

  9. #9


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    It's in 2nd Gen Mighty Max forum called "Merrill's 4G64 DOHC"

    Can't link on my phone

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