1997 E36 323i - Help with Digital Speedo unit - Which one?

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  1. 1997 E36 323i - Help with Digital Speedo unit - Which one? 
    #1
    Dr of BMW
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    CharleyNokia's Car Details
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    Hi all, some of you have probably read my thread in the General Discussions section; caught Speeding, how far out are our speedo's. Right, I've been nformed the speedo reads off the rear diff, and I have oversized tyres on the back, 40's instead of 35's, and according to a tyre size calculation site, the reading frm my speedo would be out as much as 7%.

    So, what I am looking for to remedy the situation is to fit a digital speedometer that works independently from any of the car's existing system, so no tapping into the feed to the cars own speedo or the ecu or anything.

    From what I've found there are these;

    http://www.acewell.co.uk/en_uk/speed-sensor/index.htm

    I am still a bit confused between the HALL and the REED type sensors. They both look the same. Am trying to find definitions of them in blonde person terms. HAHA.

    Has anyone else fitted a digital speedo that works outside of the car's wiring?
     
     

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    #2
    RYM
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    Why don't you just replace the tyres for the correct size OR have your existing speedo calibrated?
     
     

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    #3
    Dr of BMW
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    I can have it calibrated? I thought that was only for getting the mileage done or will it be adjusted for the size of the wheels and everything?
     
     

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    Agree with the above. After paying to have a digital speedo fitted, you could have saved money and had your existing unit re-calibrated for a fraction of the cost.

    Alternatively, slow down a bit and observe the speed limit and whats travelling behind you.
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    Current Car:

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    #6
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    So this guy doesn't come out to my car, I have to detach the speedo cable?/ But isn't my speedo cable a signal wire?
     
     

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    digital speedo would look cool above the steering cowling.

    Get onto ebay and have a dig around. the reed switch is basically how the ABS sensor works, like a magnetic switch and the splines of the hub running past it generating an electric singal Never heard of that other switch you mentioned. Probably just a glorified bicycle speedo.
     
     

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    #8
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    With the reed switch, where'd the magnet go?
     
     

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    You can stick a magnet on the rotating part of the hub, driveshaft anywhere that will be close to the reed switch. It'll have calibration/setup instructions with the system.

    If anyones ever fitted a speedo (i know lol ) to a bicycle they will know what i'm on about.
     
     

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    I personally would just fit the correct size tyres
     
     

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