mgb tach in a Series

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  • albersj51
    5th Gear
    • May 2010
    • 687

    mgb tach in a Series

    I'd really like to add a tach to my Rover (whenever I get it back into one piece). Terri Anne's site says 68 and later, but some of my reading indicates tachs from 68-76 were 3 1/8" in diameter vs 77-80, which were 4" (100mm) like the Rover.

    I know many of you own MG's so I am hoping someone can confirm what year range tach i need to look for that will fit in the multi-gauge hole in the dash of a 2A and match the speedo in size.

    Thanks,

    Jason
  • Apis Mellifera
    3rd Gear
    • Apr 2008
    • 386

    #2
    You need an RVC tach from a later car, so 68-7...2 or 3 won't work. I used a tach from a late Midget and kept the Rover gauge. I guess you'd measue the Rover gauge and use which ever MGB tach that fits.
    © 1974 Apis Mellifera. Few rights preserved.

    Comment

    • albersj51
      5th Gear
      • May 2010
      • 687

      #3
      Thanks, Apis! I know the rover gauge is 100mm/4", so it sounds like I need a 77+ MG tach.

      Comment

      • knac1234
        4th Gear
        • Nov 2010
        • 442

        #4
        Apis is right.....used to have a 78 B, and I think the tach would probably work (so a 77-80 model year I think).

        I MIGHT have one still stored away. If you're interested, let me know and I'll dig around for you.

        Julian
        Julian
        72 Series III NAS
        03 Disco
        04 Freelander (sold, but still running strong)
        2011 LR2 (Fuji White/Tan....per the wife )
        65 MGB / 73 MGBGT
        71 RHD Hillman Super Imp

        Comment

        • TeriAnn
          Overdrive
          • Nov 2006
          • 1087

          #5
          This collage is the only picture I have of my instrument panel (circa 2003).

          The MGB tach is the large gauge on the left. It requires a voltage stabilizer.

          -

          Teriann Wakeman_________
          Flagstaff, AZ.




          1960 Land Rover Dormobile, owned since 1978

          My Land Rover web site

          Comment

          • albersj51
            5th Gear
            • May 2010
            • 687

            #6
            thanks, TAW!

            Do you remember what year yours came from? there appear to be some that are electric (which is what I want) and some that are cable driven. Basically, I want what you have, the 4" electric gauge.


            Julian,

            If you come across a working one, id be interested.

            thanks,

            Jason

            Comment

            • siiirhd88
              3rd Gear
              • Oct 2006
              • 369

              #7
              Generally, the '65 and below 3 main bearing engine MGB tachs were cable driven and are 4" diameter. The '66 and '67 were electric, but were positive ground and 4" in diameter. The '68 and newer are electric and negative ground, but have the smaller size until they later changed back to the larger 4" case. The electrics have at least three different types of hookup. On the early electrics the white ignition wire wraps around a pickup, and you need the special little clamp for the pickup wire. On the second type the white ignition wires have male and female bullet connectors, and on the third type there is a seperate sensor wire that connects to the coil. The third type needs a green voltage stabilized power wire, as TA stated. There were also several different faces used. Various years of MG Midget / AH Sprite and Truimph Spitfire also had tachs that can be used. Some of the early electric tachs have a adjustment 'wheel' inside the case that can be used to change them from between 4, 6 and 8 cylinders by adjusting the pulse rate.

              Bob

              Comment

              • knac1234
                4th Gear
                • Nov 2010
                • 442

                #8
                Jason,

                Just opened my box of MGB goodies. I have the fuel gauge and speedo from my 78 B, but no tach....I don't remember selling it! Sorry....gave it a shot.

                Julian
                Julian
                72 Series III NAS
                03 Disco
                04 Freelander (sold, but still running strong)
                2011 LR2 (Fuji White/Tan....per the wife )
                65 MGB / 73 MGBGT
                71 RHD Hillman Super Imp

                Comment

                • albersj51
                  5th Gear
                  • May 2010
                  • 687

                  #9
                  Thanks, Bob..that's exactly what I needed!

                  Julian, I appreciate you looking.

                  Comment

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