Help with Wiring for Crypton Tachometer (model BS42) please
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  1. #1
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    doctor rod is offline

    Help with Wiring for Crypton Tachometer (model BS42) please

    Can anyone help with the wiring for a Crypton Tachometer (model BS42) please. I guess these are of 1960s vintage, they are made in England. I have 2 of these devices which seem identical except for a slight difference in the labelling on the terminals.

    One has the following terminals:
    "+", "-" and "LDC"

    the other has:
    "+", "-" and "CB"

    There is a self contained bulb holder for illumination. There s also a link to be removed for use on 6 cylinder vehicles, I plan to use them on 6 cyl vehicles with traditional points ignition, 12v negative earth, with intent to convert to an Ignitor electronic ignition later.

    Can anyone provide me with information on how to wire them please?

    Thank you !DSC_2288.JPGDSC_2289.JPG[ATTACH=CONFIG]295763
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  3. #2
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    Knockdolian is offline
    I’m no expert but CB will be contact barker. That will go to the points side of the distributor. LDC I’m guessing could for electronic ignition.
    -&+ as is.

  4. #3
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    NMNeil is offline
    The company still exists. Send them an email
    https://www.cryptontechnology.com/su...manuals-flyers

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  6. #4
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    I tried this but with no result

    Thanks for the suggestion, I gave this a try based on thet following sketch but the tacho did no respond (at least it didn't burst into flames )DSC_2296.JPG

    Not sure if thet Tacho is faulty? Any more ideas anyone? Thanks.

  7. #5
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    Thank you, that is brilliant, I did not know they still existed. I have just emailed them.
    Last edited by doctor rod; 11-05-2020 at 11:42.

  8. #6
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    Well I’d say that should work so maybe it knackered. Just to be sure , your diagram showed it but you are definitely neg earth ?

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