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Tiny Tach on fuel injected outboard

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  • Tiny Tach on fuel injected outboard

    Hi all,

    do anyone one has experience with fitting a Tiny Tach or equivalent on an fuel injected outboard? I have done it on the spark plugs which is very straightforward but wonder if this set up would work if you wrap the sender wire around injector ignition coil?

    If not I see the only option to use another type of meter, epoxy the magnet to the flywheel and fit the sender through the plastic cover which I have done previously on myHonda BF20

  • #2
    Tiny Tachs work the same for any spark plugged motor. No matter what fuel system, a plug wire is wrapped with the sense wire. You can wrap around an injector all day long and it will not work.

    What Tiny Tach did you get that requires a magnet?
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    • #3
      you need the 40,000 volts that goes thru a spark plug wire to trigger the very very very very very minute signal up the trigger wire to the tiny tach.

      the 12 volt pulse from the injector wont do squat to trigger a tiny tach.... unless you fire the 40,000 volts from the spark plug lead thru the injector wire.... and fry your computer and injector.
      Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

      1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

      Past Boats
      1970 Wooster Hellion - Merc 9.8
      2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
      1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

      What’s behind you doesn’t matter. – Enzo Ferrari

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      • #4
        Thanks for your replies guys, all makes sense to me

        Originally posted by GA_Boater View Post
        What Tiny Tach did you get that requires a magnet?
        it is not the Tiny Tach but another brand, you can find plenty on Amazon they are called “proximity sensor tachometer” which have a small strong magnet (I have epoxied it on flywheel) and the wired sensor (fitted through a drilled hole in the plastic flywheel cowl)

        The magnet and the sensor must have 2-3mm gap between them otherwise the tachometer does not pick up the signal

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        • #5
          on an EFI motor, why not simply plug in the Honda tach to the Honda motor.
          Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

          1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

          Past Boats
          1970 Wooster Hellion - Merc 9.8
          2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
          1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

          What’s behind you doesn’t matter. – Enzo Ferrari

          Comment


          • #6
            Originally posted by Scott Danforth View Post
            on an EFI motor, why not simply plug in the Honda tach to the Honda motor.
            Just want to fit a tiller handle on it and ret rid of the wiring loom

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            • #7
              Sign up today
              the tach can be mounted on the cowl if you want.

              it also has diagnostics.
              Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

              1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

              Past Boats
              1970 Wooster Hellion - Merc 9.8
              2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
              1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

              What’s behind you doesn’t matter. – Enzo Ferrari

              Comment

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