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Steven, I wouldn't worry about speedo tampering. I've owned two 911s, a 1971 and a 1980, and I had to repair both speedos because of broken trip odometer drive gears. One broke at 80,000 miles and the other at 97,000 miles. It seems quite common for them to break and it's necessary to open the case to remove and repair the gears. Good luck!
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