Please help! 1987 325is with s52 swap from a 91 325i no tach

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  • PRF3CT
    Advanced Member
    • May 2013
    • 173
    #1

    Please help! 1987 325is with s52 swap from a 91 325i no tach

    I have a complete e30 engine swap from my buddies 1991 325i. My car is a 1987 BMW 325is.

    I'm having an issue where my RPM tach isn't working now that the swap is complete. Does anyone know what wire I should be looking for to make my tach work?
    Tags: None
    • mpowerful
      E30 Fanatic
      • Jul 2013
      • 1273
      #2
      The tach signal is fed to the car via c103/c104 in glovebox im pretty sure. You gotta figure out which pin it would have been on late c101 then route that to the c103/104. Same for speed signal to dme.

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        • tytypetersen
          Grease Monkey
          • Mar 2012
          • 347
          #3
          Make sure you don't have any blown fuses. My rpms didn't work after my swap and it was a fuse in the fuse box

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            • NotJesus
              Advanced Member
              • Mar 2015
              • 169
              #4
              Originally posted by mpowerful
              The tach signal is fed to the car via c103/c104 in glovebox im pretty sure. You gotta figure out which pin it would have been on late c101 then route that to the c103/104. Same for speed signal to dme.
              Is the same thing true for OBD1?

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