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Tachometer trouble-gctid823595

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    Tachometer trouble-gctid823595

    We've had our present boat for 10 years and the tach has never functioned properly. It mostly over states the actual RPM, though at times it functions accurately. Tapping on the glass face causes it to function correctly for a short period, but then it seems to short out and the needle starts bouncing then returns to a fictitiously high reading. I've removed and cleaned the terminals. Is this simply a bad tach?
    1999 Ciera 2655 5.7L BIII "Brenda Lou"
    1996 Skeeter 1850DV 175 Mariner 9.9 Mariner. sold, sold, sold
    1975 Lund 14' 25 HP Mercury. sold, sold, sold
    2008 Dodge Ram 2500 4x4 6.7L Turbo diesel Quad Cab
    Green Bay, WI on the Fox River
    South Bay Marina

    #2
    Had a similar issue on an older Chris Craft tach. I opened the tach housing and found the "armature" ground was not robust. I soldered a very fine wire from the "armature" to ground and it worked fine for years. I coiled the wire a few turns to allow the needle to sweep properly.

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      #3
      It also could be that you 4/6/8 cylinder selector isn't making good enough contact. Rotate it a few time and se if it gets any better.
      P/C Pete
      Edmonds Yacht Club (Commodore 1993)
      1988 3818 "GLAUBEN”
      Hino EH700 175 Onan MDKD Genset
      MMSI 367770440

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        #4
        Did the 4/6/8 switch and still not working correctly.
        1999 Ciera 2655 5.7L BIII "Brenda Lou"
        1996 Skeeter 1850DV 175 Mariner 9.9 Mariner. sold, sold, sold
        1975 Lund 14' 25 HP Mercury. sold, sold, sold
        2008 Dodge Ram 2500 4x4 6.7L Turbo diesel Quad Cab
        Green Bay, WI on the Fox River
        South Bay Marina

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          #5
          Sounds like I should remove the tach and tear it down. Thanks all.
          1999 Ciera 2655 5.7L BIII "Brenda Lou"
          1996 Skeeter 1850DV 175 Mariner 9.9 Mariner. sold, sold, sold
          1975 Lund 14' 25 HP Mercury. sold, sold, sold
          2008 Dodge Ram 2500 4x4 6.7L Turbo diesel Quad Cab
          Green Bay, WI on the Fox River
          South Bay Marina

          Comment


            #6
            If it's a Faria gauge they do have a warranty but I'm guessing the age of yours makes it out of warranty. Their website says that a tach repair charge is $100. I had an intermittent problem with the tach on my 275 and finally it quit working altogether. Bought another Faria replacement off eBay for $95. Cheaper than paying Faria to repair it.
            1990 2755 - sold
            2005 275 - sold (now boatless)

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