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Did the same on the way to work this morning. My speedo is jacked. There is no place to open it up, but I had to do 39-40 on the speedo to get a consistent 35 reading on my GPS. And had to do a solid 50 mph to get 45 on my GPS. No wonder I haven't been pulled since I bought this car 10 months ago.
Gonna' try and run I-94 around 10:00am (hopefully I won't have to dodge much traffic) and see if I'm off by a constant or a percentage.
P.S. Any fixes for this other than altering my tire size? I know back in the day, with my Chevys I could get a different plastic speedo gear to adjust for this, but I'm just beginning to become familar with the Porsches.
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1997 Porsche Boxster
Threaded Mode
