Dear Glenn, marxjunk, and mid-60s Buick owners who do want to know at what speed they are traveling,
. . . I have checked the white car using the GPS unit and it matches the speed of the car.
. . .
Not to take this thread too much on a detour, but having just gotten my own speedometer calibrated once more I'm curious. How robust are the 1964-66 Buick A-body speedometers? Has anybody had to have one repaired and how hard was that to do?
A curious mind would like to know!
Cheers, Edouard