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  1. #1
    My Boats:
    95 Top Gun
    Join Date
    Jun 2006

    Gaffrig Speedo calibrate

    How can I calibrate the speedometer ? I did some comparing speeds with a hand held GPS and the pitot/speedo is 10 to 15 mph slower than GPS . Or should I just toss the stock unit for a new GPS Speedo .

  2. #2
    Drive to arrive alive!!! Platinum Member WARPARTY36's Avatar
    My Boats:
    2014 Cigarette 39 GTS
    Join Date
    Apr 2002
    I have the same problem Good question
    They call me BUBBA like one of them big ol' redneck boys............Can you believe that???

  3. #3
    Registered H2Xmark's Avatar
    My Boats:
    1997 Fountain 35 Lightning
    Join Date
    Apr 2001
    beaumont tx
    mine reads slow also, i tried drilling[enlarging] the brass adapter that screws to the pitot tube but all it did was make my needle bounce, i have another adapter to put back into it, looks like its time to go into the gauge itself

  4. #4
    Platinum Member Platinum Member Scott B's Avatar
    My Boats:
    Donzi Criterion SS, X-18 , 16 OB, Z-235, F-14, Magnum Missile
    Join Date
    Dec 2000
    Slightly North of Cuba
    Send it to Gaffirg.. If its that far off something is seriously wrong... My Gaffrig (Livorsi) is within 1 - 2 MPH at its worst.. I am using the transom mount P/U though... And, I am "assuming" You have already checked the lines to the back and the water pickup..??

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