I have a 95 civic.  The speedometer works intermittently, sometimes
jumpy.  I have learned it isn't a cable.  Is there a sending unit that
goes bad that can be replaced?  I unplugged the wiring for it and
removed two bolts under the connector on the transmission, but it
refused to come off, if anything does come off.  I'm afraid to put too
much force on it if it isn't supposed to be removed.  Any help is
appreciated.

John