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There is a cable that runs from the transmission to the speedo and it can break. You likely need to replace the cable. If it's not the cable check to be sure all your fuses are in good shape and not coroded.
It looks like there is loose connector behind your Instrument Cluster(gauges)It is pretty easy to do this but here is helper link how to go about it... http://www.986faq.com/5-0/default.asp#005
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.
if you look up fuses in your manual, it should send you in the right direction. If you don't have one, get a test light and ground it to your door hinge. Turn your key on and check each fuse by touching the silver part on the back of the fuse (each side of the amp #) with the test light. It should light up on both sides of the fuse. If it doesn't, it's burnt out. Or... you can pull them out one at a time, and visually inspect them.