I just picked up an 82 500SEC euro and on the way home I noticed that my gps would show 2 - 3 mph change, at 70 or so, but the speedo did not change until the gps speed changed by about 4 mph. Any one ever check your speedo against a gps unit and seen this or is my electronic C126 speedo wacked?

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85 300 SD ~ 115K
82 500 SEC Euro ??K
78 450SL 164K