As has been mentioned here before, the fuel needles sometimes get bouncy, frequently an issue with the sender inside the fuel tank. I just removed my sender and cleaned it up, hopefully this will solve the problem. The W123 sender is below the first aid kit holder. I unscrew mine by clamping a jumbo vice grip on it.
http://www.irwin.com/tools/locking-tools/the-original-large-jaw-locking-pliers
Of course, remove the wires, and then you can clamp the vice grips on and use a screwdriver as a lever to turn it. Have a plastic bag ready to put the sender in, it will be full of fuel and dripping.
Once removed, you can use a pair of pliers to unscrew the nut at the bottom, and carefully remove the exterior tube. It may be full of nasty goo so do this over some old newspaper.
The wires are flimsy but I just folded a 1" x 2" piece of fine sandpaper over each one and ran it up and down the length to knock off any crud that may have collected on it. The float has some contacts on it and I used a small screwdriver to try and bend them so they would make stronger contact. I sprayed the contacts with gum cutter aka carb cleaner. Also sprayed out the tube a bit and then put it back together. Hopefully this will solve the bouncy needle. Took about 30 minutes.
Jim
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