There is a fellow in California who makes speedo gear boxes for things like the MGA rear end in a TD.  He will tell you how to calculte and then make a gearing to suit.  We got one a short time back for under $200 US.
 But I don't really think you will exceed 120kph in a TC unless you have it supercharged or fall off a cliff. . . . And It would be one strong driver that would be able to handle it at that speed.    
 In the 50's there was a supercharged TC around here driven by a lady on Airport courses.   NO guys it wasn't me.    I'm the original sissy, except I turned a ton in my Volvo Wagon once.
Re speed comparisons
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