[TR] Toyota 5 speed and spedo calibration

[Frank Fisher]

i recently took my TR3 out on the freeway with my tomtom GPS. i have a Toyota 5 speed installed and was curious to see how far off my speedometer was. i was delighted to see that it was consistently just 3 mph faster than actual (GPS) speed. this was true for speeds 40/60 and 80 mph.
i seem to recall some suggestions that the calibration could be up to 10% off.
I'm just curious about the findings of others with the Toyota conversion.
thanks
Frank