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Who knows the number on the bottom of the tach for a 1974 MGB with an OD transmission? I put the OD from a 74 GT into my roadster but I am under the assumption I need to change the tach. The tach I took out of the GT is amongst several with different numbers on them so I don't want to make a mistake. Do I need to change the Speedo too and if so what number is on it?