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replacing a tachometer on a detroit

Discussion in 'Post Yacht' started by about time, Aug 15, 2016.

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  1. about time, Aug 15, 2016
    #1
    about time

    about time Member

    Joined:
    Oct 17, 2009
    Messages:
    109
    Location:
    ponce inlet fl
    I have a aqua meter tachometer 0-35 rpm in 100 increments that has failed. It works off a tach generator on the back of the Detroit 671. Has anyone replaced a tachometer on this set up? What kind of voltage does the generator produce? Are we metering voltage or frequency?
  2. baltimore bob, Aug 15, 2016
    #2
    baltimore bob

    baltimore bob Member

    Joined:
    Sep 22, 2013
    Messages:
    314
    Location:
    Baltimore, Maryland
    I just replaced the same instruments on mine with digital units I bought used. Had to replace the tach senders. The Aqua Meter is using variable voltage as the signal where as most modern units use pulses (frequency). You will need to replace the sender with something that matches your new tach. Unfortunately I just threw my 2 working ones away.
  3. Caltexflanc, Aug 16, 2016
    #3
    Caltexflanc

    Caltexflanc Senior Member

    Joined:
    Sep 25, 2011
    Messages:
    244
    Location:
    North Carolina
    Lauderdale Speedometer and Compass will know what you need and hook you up. Great folks. https://www.lspeedo.com/
    I bought tach senders from them for my 8v92tii's.