Ok, I started rebuilding my civic back to the shape it should be in. Today I replaced front rotors and pads, and attached some missing plastic pieces around the car.

Now, I remember there was a problem with a speedoo going crazy especially on cold days. It will just start bouncing up and down, than settle and work normally until it decides to start acting up again.

What causes this problem and what is the solution.

Also, can I replace it with some other cluster but with tach? I know that on neons, all the wiring is already in place and if you swap the clusters RPM gauge will work just fine.
I have a basic 92 civic DX 4dr.

Thanks,
Neven