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Fuel/Air ratio gauge

Discussion in '114 type 1600, 2002, 2002ti/tii (1967-1976)' started by Bruce Henry, Aug 7, 2014.

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    Bruce Henry

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    Hi Rob,

    I read an article in the latest Roundel about your travels with your Tii. You mentioned an Air/Fuel gauge on the dash of your Tii. I would like to put one in my Tii also. Could you tell me where to purchase one and how to hook it up?

    Bruce Henry
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    Bruce, there are many threads on this on bmw2002faq. Here's one:


    Here's another that links to a bunch of other posts:


    Basically, an afm gauge uses an ultra wide exhaust gas (UEGO) oxygen sensor that has to be mounted in the exhaust manifold or headpipe, connected to a gauge. Typically you need to:

    --Remove the headpipe
    --Drill a hole to receive a threaded bung
    --Have the bung welded in place
    --Reinstall the headpipe
    --Install the UEGO O2 sensor in the bung
    --Install the gauge in the dash
    --Install the wiring harness (not a trivial task, as some of it has to go through the firewall somewhere)

    I and other folks like the AEM 30-5130B because it's analog and doesn't look out of place on a vintage dashboard, but there are many choices.

    There's, I believe, one sensor that telemeters its data to an iPhone so you don't need to run a wiring harness and install a gauge at all.


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