VDO Speedo electronic pickup





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  1. #1
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    Default VDO Speedo electronic pickup

    I need to make / modify some kind of sensor for a VDO speedo in my bakkie.

    Problem is that the gearbox I have does not have a speedo drive gear (none available, classic vehicle, long story...)

    Anyhow, as I see it with the VDO speedo gauges you can syncronise it etc. so I only need a sensor somewhere (propshaft / wheel, etc.) to which I can set the pulse rate.

    Any suggestions?

    Thanks very much.

  2. #2
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    Default

    Found a photo-conductive pulse sensor of some sorts. It basically picks up if metal moves past it and sends a + pulse back.

    Will make some mounting brackets and try and fit it over the weekend to see whether I can resolve the issue.

  3. #3
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    Default

    My neighbour uses similar pickups for the units they fit to the cars when they do the Total Economy Run.

    He sommer welds a small piece of metal onto one of the front wheel hubs and mounts the pickup unit in close proximity. But I was always wondering about is the imbalance this causes. Since it is not to far from the stub axle it can't have to great an effect and they only use theirs for a limited time/distance, but in the long run it the added strain might damage the bearing

    Alternatively how about fitting the pickup in close proximity to the Universal Joint at the back of the gearbox and the bolts that protrude can be used as the reference piece of metal for the pickup But you will have to experiment and see if that will be a good enough place for the fitment.
    Last edited by benhur; 2007/08/04 at 12:01 PM.

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