I've always liked the early Dolomite clock faces and aspire to install them in a Sprint.
Yesterday, I acquired a 2.5 PI speedo which has the correct 140 mph calibration...only to be immediately disappointed to see that it reads 840 revolutions per mile rather than the Dolomite 1000 revolutions per mile.
Now, I could go to the effort of calculating the differences caused by the different axle ratios and wheel circumferences, and then see if I can determine and source a speedo drive toothed to suit to make the clock read accurately....or I could ask if anyone has done so before!?