Question about 1992 Porsche 911
The speedometer on our 911 was not working either. Speedos measure spinning magnets that are glued to a disk in the transaxle. Sometimes they come off. I replaced the disk...didn't fix. Sent Speedo to a shop in CA and they said unit was fine. Even took car to master mech at a Porsche shop, he couldn't solve issue either. Turns out our problem was the ignition switch. The speedo has one wire lead coming from the back of the switch. I determined that needed replacing when I ran a wire from the battery directly to the speedo. Replacing the ignition switch SOLVED out problem.
Posted on Feb 27, 2015
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Posted on Jan 02, 2017
There is a gear in the speedo that breaks. This is plastic gear on a metal shaft. The last fix I did was to remove speedo and open it up. I super glued the cracked gear to the shaft because I was unable to find a new one. It worked again with no future problems. I hope this helps.
Posted on Jan 30, 2009
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