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412 speedometer and tripmeter

Discussion in '365 GT4 2+2/400/412' started by lazaruslong, Mar 12, 2008.

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  1. lazaruslong

    lazaruslong Karting

    Aug 9, 2006
    86
    #1 lazaruslong, Mar 12, 2008
    The speedometer and tripmeter on my 1988 412 quit working the other day. Found nothing in the spareparts catalogue, nor in the shop manual. Someone said it's electronic and not mechanical, but still, how does one repair it, and what can be repaired/ replaced?
     
  2. SouthJersey400i

    SouthJersey400i Formula 3

    Mar 14, 2007
    1,679
    Romulus, NY (Finger Lakes)
    Full Name:
    Ken Battle
    #2 SouthJersey400i, Mar 13, 2008
    Yes, it is electronic since my '84 400i already was. (My tripmeter is manual.

    Only solution, pack it up and send it to Palo Alto Speedo. I think you will get other similar responses. It is easy to remove from the dash with the one knob on the face.
    Ken
     
  3. dstacy

    dstacy F1 World Champ
    Owner Rossa Subscribed

    Jan 23, 2006
    11,998
    GMT -5 & GMT +1
    Full Name:
    Dave
    #3 dstacy, Mar 13, 2008
    Palo Alto, the one and only.
     
  4. lazaruslong

    lazaruslong Karting

    Aug 9, 2006
    86
    #4 lazaruslong, Mar 14, 2008
    What I would like to know is the cause for this failure. I believe the instruments receive a signal, probably from the transmission, this signal generator could be faulty, but where is it situated?
     
  5. moserpe

    moserpe Karting

    Jul 20, 2006
    137
    Switzerland
    Full Name:
    Peter Moser
    #5 moserpe, Mar 14, 2008
    Check at the drive shaft end of the transmission!
    If both, speed indication and mileage counter have stopped to work, the problem is most likely somwhere in the electrical signal transfer from the sensor to the instrument or the sensor itself.

    Peter
     

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