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SPEEDOMETER and ODOMETER

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    SPEEDOMETER and ODOMETER

    Over 2 years ago I purchased a 325e 1985,5 Speed manual.The car was in bad shape and after 24 months the car is running well.The car still needs some cosmetic work but we will get there.

    Now the speedometer and ODOMETER. These two work together but if your gears break on the odometer your SPEEDOMETER is not effected.

    After reading threads or posts regarding what to look for regarding the speedometer not working this is what I did. I had the cluster board refurbished and installed New lights. I replaced the differential sensor and checked and tested the line from the differential all the way to the cluster,continuity/ conductivity was positive.
    All the gauges were working except the speedometer.- Finally,I bought another used head unit, just to see what would happen. I found one Motometer unit on eBay,taking a chance. I took mine apart, replaced the gears in the odometer of the new head unit,untested by me. And what do you know?!...it began to work.
    A lot of reading,research and testing took place. I Also checked fuses,ultimately it came down to a bad head speedometer unit.

    I hope this clears a lot of concerns people might have regarding the fix.
    Cluster board, from Programa
    New SI board, battery less,from Programa.
    New Speed sensor.
    Test fuses 10,12,21.
    Check line while car is on, from differential speed sensor to plug connector at cluster.Check for conductivity.

    Good luck. If you have question ,let me know.

    #2
    95% of the time a non working speedo just needs new gears so that's the first (and usually the only) thing I check
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