1994 honda civic lx speedometer problems

sometimes speedometer works normally, sometimes lies dead flat, sometimes bounces all over the place

is it the speed sensor? is it a dirty electrical connection?

I'm a newbie, where is the sensor located?

any help would be appreciated.

Mine did this forever and it was the actuall speedo head. I bought a used one and now it works fine with 100000 less miles. Great deal and very easy to replace.
matt

I read another user's solution and after trying many things...YOU HAVE TO TRY THIS.

Look under the hood and find some wiring grouped under the intake. The wiring has been rubbing against a metal piece and this rubbing has caused the wires to be bare. The short is hurting the operating of your speedometer. With some electrical tape and some effort you can fix this in 20 minutes. Wrap the electrical tape around the wires where the wires are rubbing against the metal piece. It will be obvious if you get your elbows a little dirty.

Otherwise you can try and replace the VSS and Speedometer only to be out hundreds of dollars and still have a faulty speedometer.

I did it tonight, and after months of anguish I fixed my 98 civic.