coupedup

Anyone know what it could be? My gauge cluster needs use to stick every once in awhile but now it has all of the time. Although sometimes overnight they will work fine, but most of the times they wont. Even if I have my car off for a couple hours they will stick. It is only the speedometer and tach. When it does stick though, if I just lightly touch the needle it will rise up to the speed/rpm. Any help would be appreciated.