When I bought this car the odo wasn't working. I took it apart and replaced a gear. It has been working fine for 6 months. I just noticed this weekend it is running too fast. It clocked 9.8 miles when my gps said 4.8. What could be causing this? Speedo is working correctly.

I did have a fuel line break and had to drive 90 miles with it spewing fuel on the side of the engine. I don't think there are any sensors that have to do with speed in that area though.

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1987 300 SDL
2000 E320 Wagon