About a month ago i removed my cluster to repaint the needles and add the tach to my 240. Ever since then my speedo would bounce up to 20mph. After i put it back in that night it was smooth as glass. I didnt touch the cable other than to disconnect and reconnect. Now the speedometer sticks on the stop until about 20-25mph then jumps up and works fine until i leave from another stop again. If i tap the dash lightly right when i take off it works fine. Anyone have any idea what might be causing this?

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