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RPM Tach hook up on a PT fuel system

Discussion in 'Trucks [ Eighteen Wheelers ]' started by 94kenworth, Sep 4, 2012.

  1. Sep 4, 2012 #1
    94kenworth

    94kenworth Bobtail Member

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    Sep 4, 2012
    0
    Was wondering if any one can tell me what I need to hook up a electronic RPM tach to a PT fuel system. I have a 94 kenworth with a Formula 290 Cummins in it and the tach dont work and need to know were to start looking, It original had a 3306 cat motor in it.
     
    94kenworth, Sep 4, 2012
    94kenworth, Sep 4, 2012
    #1
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  3. Sep 4, 2012 #2
    bender

    bender Road Train Member

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    Don't Kid Yourself
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    bender, Sep 4, 2012
    bender, Sep 4, 2012
    #2
  4. Sep 4, 2012 #3
    DieselDummy

    DieselDummy Light Load Member

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    Apr 1, 2012
    Willet,NY
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    My 87 uses basically a speed sensor in the bell housing, it might have just broke a wire, mine is located in passenger side.
     
    DieselDummy, Sep 4, 2012
    DieselDummy, Sep 4, 2012
    #3
  5. Sep 4, 2012 #4
    pup

    pup Light Load Member

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    n.h.
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    The bell housing is the most common spot. Its a 2 wire sensor. If the bell housing doesn't have a tapped hole, stewart warner offers a sensor that runs off the fuel pump tach drive. That sensor may require the use of a stewart warner tach.
     
    pup, Sep 4, 2012
    pup, Sep 4, 2012
    #4
  7. Sep 4, 2012 #5
    SmokinCAT

    SmokinCAT Road Train Member

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    Hillsboro, OH./ Adrian, MI
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    The stewart warner may be your only option, the engine I have that started as a 290 does not have the option for the bell housing tach. I believe you do have to use their tach though.
     
    SmokinCAT, Sep 4, 2012
    SmokinCAT, Sep 4, 2012
    #5
  8. Sep 5, 2012 #6
    Autocar

    Autocar Road Train Member

    3,167
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    Apr 28, 2012
    The Hot Rod Shop Oxford, AL
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    You should have a tapped hole in the bellhousing, my '84 BC III 400 does. It is offset to the passenger side, from bottom center.
     
    Autocar, Sep 5, 2012
    Autocar, Sep 5, 2012
    #6
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