I do not own a 240 yet, but I am pending a buy on an s13. I had a similar problem with my jeep though. It is an '88, so it doesn't have a whole lot of electronics. My speedo and odometer stopped working, and so I took the dash apart. Turns out there was a metal casing with a flexible cable in it that the wheels spin to tell the speedo how fast you are going, and this had fallen off. If you havent loked at the back of your gauge panel, I would do that.
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