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electronic speedometer installation

Discussion in 'Norton Commando Motorcycles (Classic)' started by norvillnh, Jul 10, 2019.

  1. norvillnh

    norvillnh

    Joined:
    Mar 24, 2011
    someone has done this, no doubt. Any tips on installing, wiring, calibration on the Smiths Electronic speedometer. M75 Mk 111
     
    Torontonian likes this.
  2. tomspro

    tomspro VIP MEMBER

    Joined:
    Jan 25, 2014
    Dump the ugly speedo cable and get the magnetic sensor option.
    I glued a strong ceramic magnet from Hobby Lobby onto my rear drum with wired optional sensor taped to chainguard.
    Calibrate using instructions (not fun) but once done it is spot on.
     
    swooshdave likes this.
  3. Torontonian

    Torontonian

    Joined:
    Dec 28, 2009
    Instructions are stopping me , so if anyone can post their own clearer one we can proceed on this without shorts. Same bike MK 111 76.
     
  4. MexicoMike

    MexicoMike

    Joined:
    Jan 31, 2010
    "Not Fun" is the kindest comment I have read about it! Having done it myself, I'd call it a ROYAL F^$%#^K pain in the a$$! I exhausted all the swear words I know and had to come up with some new combinations of them to get me through it. ;)
     
  5. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    +1 Mike. It is a job I dread having done it twice now.

    But, IMHO, if you allocate the time, clear yer head, and just slowly and carefully follow the instructions and check / double check each step, it all goes quite smoothly.

    The number of wires and complexity involved is staggering, and scarey at first glance. But break it down, follow each step, check as you go, and you should be fine.
     
    norvillnh likes this.
  6. nortoneye

    nortoneye

    Joined:
    Jun 21, 2012
    Yes it is an afternoon job for sure, I ran power off an open slot on the switch and mounted a momentary switch near the ignition switch to toggle between the trip tic and odometer. Used the bolts for the coil mounts for ground. Take your time, solder all the wire joints with shrink wrap and having just returned from a 500 mile round trip, they worked flawlessly. Did the suggested calibration process but found the conversion factor had to be altered to make the speedo more accurate to my GPS. I am running Avon RoadRiders 100/90-19 and the conversion factor was 1060 instead of the calculated 975. This makes the odometer about 4% UNDER actual miles. I choose to have the speedo be accurate and not the odometer. Overall I am pleased with the update. Never hurts to have a beer or single malt handy!
     
    norvillnh likes this.
  7. cliffa

    cliffa

    Joined:
    May 26, 2013
    *** Thread Derail Alert*** - somebody just mentioned ”SOlDER”

    :eek::eek::eek::eek::eek:
     
    Last edited: Jul 13, 2019 at 12:35 AM
    MichaelB likes this.
  8. MexicoMike

    MexicoMike

    Joined:
    Jan 31, 2010
    Hmmm...I'll bet you're right; someday I'll have to try that sort of logical process! :)
     
  9. nortoneye

    nortoneye

    Joined:
    Jun 21, 2012
    Sorry about that, what was I thinking??
     
  10. cliffa

    cliffa

    Joined:
    May 26, 2013
    I think you got away with it. ;);)
     

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