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  1. #1
    Click avatar for tech links/info, donation request K447's Avatar
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    Arrow Substituting failed MFD displays with MSX NGI displays...

    Given the ongoing failures of the oval Multi-Function Displays (MFD), which are long out of production, I have been toying with the idea of adapting the newer Polaris NGI type displays as replacements.

    I am interested in what others think of this option.

    So far I have been looking at it mostly from an electrical and functional perspective.

    I expect a simple conversion plug would allow the NGI display to plug into the MFD harness connector (8-pin or 12-pin). The NGI 12-pin connections are NOT a direct plug in from the older Polaris models, even from the 12-pin MFD.

    The compact oval Polaris MFD display has many features packed in, several of which are not present on the much newer NGI displays.

    MSX 140 NGI display compared to MFD
    The RPM tachometer, fuel and oil levels would match up and work.

    Overheat warning with red lamp would work, and there is a display message but no RPM limit for low fuel or low oil.

    Clock would be present, and engine hours and peak RPM would be logged by the display.

    Low battery voltage warning would work.

    What won't work
    The Speedometer system on the MSX is different, so there is no easy way to adapt the MSX speedo input, which is electrical, to the pitot tube air pressure signal from the MFD system.

    It may be possible to create a simulated speedo input signal, which would calculated from RPM. It would not be highly accurate, of course.

    A more expensive (and farther into the future) possibility is to adapt a compact GPS derived speed signal to feed into the NGI display.

    The Trip odometer also depends on the speedometer input, so that would not function.

    There is no Trim feature on the MSX display, but trim itself would still work, you just won't be able to see where it is on the display.

    If the MSX 110 or MSX 150 NGI display is used, there is no oil level indicator. There may be a way to adapt the Weber engine low oil level warning input to sense the oil tank sender signal, but I have not looked into that yet.

    There is a faux 'Turbo boost' indicator on the MSX 110 and MSX 150 NGI displays, which will rise with RPM

    Other issues
    The NGI display uses a single external Mode button, in addition to the single Reset button on the NGI display itself.

    This mode button is located on the left handlebar on the MSX models, but it can be located anywhere that makes sense. The Mode button simply pulses 12 volt battery power to a pin on the display connector.

    Mechanical
    The NGI display is larger, and a different shape, than the compact oval MFD display.

    Someone who has both display types could measure the dimensional and mounting differences, and provide comment on what would be involved in physically mounting the larger NGI display into the handlebar pad meant for an MFD, or into the MFD dash panel space.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  2. #2

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    did you tryed the fix i found for broken oval mfd's on the other topic ?

  3. #3
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by townkat View Post
    did you tried the fix i found for broken oval mfd's on the other topic ?
    I am well aware of the self-repair options for the oval MFD, but many MFD are simply not repairable, for any number of reasons.

    This is an attempt to create another option.

  4. #4
    Bing-A-Ding-Ding-Ding, Brrrrrap! Brrrrrrrrrap!!! Polaris_Nut#1's Avatar
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    cool idea, what about other manufactures displays? I haven't ridden anything other than a Polaris in years, so I wouldn't know where to start.

  5. #5
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by Polaris_Nut#1 View Post
    cool idea, what about other manufactures displays? I haven't ridden anything other than a Polaris in years, so I wouldn't know where to start.
    I am open to suggestions.

    The fuel and oil level sender signals seem to be fairly universal.

    RPM signal may be trickier to adapt.

    Warnings, Trim position and such, that would depend on the display.

    Any suggestions for non-Polaris PWC displays that physically would be a reasonable fit replacement for the oval Polaris MFD?

  6. #6
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    As far as the trim is concerned. The 96 SL700 came stock with a trim guage that was cable driven from the trim motor. Mounted to the left of the counsel.

  7. #7
    Click avatar for tech links/info, donation request K447's Avatar
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    Some comparison photos.

    The NGI is a much bigger display overall. I don't have any handlebar pads and dashes that fit the oval MFD units, so someone else can do some measuring and figuring.

    The black plastic rear 'legs' on the NGI casing could be trimmed off, and the chromed outer rear 'shell' (not shown) just unscrews.
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  8. #8
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    Looking at this, would it be possible to get the paddle wheel speed sensor to make the speedo work with this display? Are they still available? Is this what would be needed?

    http://weberpower.com/electrical-spe...er-sensor.html

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