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My 996 speedo also reads exactly 2 miles an hour fast. I think it's built to err on the side of optimism by design. I remember reading something to that regard some time ago. My '87 is actually much more optimistic by around 10% according to GPS.
Can't help on your gauge problem.
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'87 911 Coupe
'95 911 Coupe
'04 911 GT3
'98 Jeep Wrangler
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