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I have posted this adjustment on VFF and it comes directly from Leonard Nickols who rebuilds and sells Model A speedometers. This is an adjust to correct the speed error on the round Stewart Warner speedometer. When rebuilders rebuild speedometers they mostly check to see that the mileage(odometer) reads correctly, not the speed.........
Remove the speedometer from the dashboard. Now carefully remove the cover on the back of the speedometer. You will see a very small hair spring on the top of the rotating speed wheel which has an small screw at it's center. Now move the speed wheel to show the speed you were reading while driving (50MPH) and note the position of the hair spring adjusting screw (let's say the slot runs 4 to10 o'clock). Now move the speed wheel to the corrected MPH you want the speedo to read (46-GPS). Look at the hair spring adjusting screw and adjust it to the position you saw for the 50 MPH reading. Your speedo should now be calibrated.