tach info

Discussion in 'The Projects Forum' started by choco1911a1, Dec 30, 2010.

  1. choco1911a1

    Thread Starter New Member

    Aug 30, 2010
    1
    0
    i am putting a cummins engine in to a ford and i don't want to spend alot of money to a"kit" to make my tach work and would rather fix it my self i have a hall sensor that has two hashes on the harmonic balancer on the cummins and a tach on the ford that needs 12 pulses from what i am told to get the tach to work properly on the ford which requires a mag pickup signal i was also told that i need a pulse multipler to get the signal where i need it HELP


    thanks
     
  2. debe

    Well-Known Member

    Sep 21, 2010
    946
    184
    Hi Choco. I remodeled a VDO tacho & used this circuit to drive the meter & it uses a Hall device found in many VCRs as a reel sensor. I made this setup to put on a Yanmar diesel in a boat & stuck a magnet on the crank pulley, its still working 8yrs later.
     
  3. debe

    Well-Known Member

    Sep 21, 2010
    946
    184
    This is how i calibrate Hall driven tachos using 50Hz, this gives a reading of 3000Rpm when the Hall is held near the open end of a small solenoid (this to came out of an old VCR) This calibration is for one magnet on a pulley, if 2 magnets are used halve the RPM.
     
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