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Thread: E30 1986 325i Tacho & Economy guages inop.

  1. #1
    Join Date
    Oct 2014
    Location
    Auckland, NZ
    Posts
    1
    My Cars
    E30 1986

    E30 1986 325i Tacho & Economy guages inop.

    The instrument cluster circuit board badly damaged due to failure of Ni Cad batteries. I replaced the circuit board with one with Lithium batteries. The service indicator now works but no Tacho or economy guage working. Are these two boards interchangeable? Resistance measurements engine speed sensors pins 27 & 8, 25 & 26 of ecu Motronic 1 - 1000ohms. Please help. Thanks.

  2. #2
    Join Date
    Aug 2009
    Location
    sunnyvale CA
    Posts
    1,589
    My Cars
    325is
    Who did the modification?

    The car cluster is not designed to use Li batteries. If you over charge it it can catch on FIRE unless a protection recharge circuit is installed. NiMH rechargeable batteries are a better alternate.

    I don't know about the other stuff.
    Last edited by gc325is; 11-01-2014 at 12:53 PM.

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