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diesel OEM tach wiring?

Discussion in '1982-Present GM Diesel' started by Steve_87K5, Jan 5, 2004.

  1. Steve_87K5

    Steve_87K5 1/2 ton status

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    Location:
    central NC
    Was there an OEM tach available in a 6.2L '87 K5? I looked at an '85 wiring diagram, and could find no ref to tach connections.
    I'd like to keep my factory (gas) tach when I swap in the 6.5L.
    There was an ESS on some 6.5L vacuum pumps. Maybe tach signal is taken from this?
     
  2. alec78

    alec78 1/2 ton status

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    Don't know about the 6.2 wiring, but the 6.5 got its signal from a dummy shaft where the vacuum pump was in a 6.2. I know not much help but its something...
     
  3. bigblock454

    bigblock454 Clack Clack Clack Premium Member

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    Location:
    Terre Haute IN
    I have never seen or heard of a 6.2 with a factory tach, but I know some altinators have a tach output, maybe that was used?
     

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