a/c and speedos

[fiend@netcom.com (Butch Casualty)]

two questions...

first, i was driving home from work yesterday when i noticed my speedo acting
strange (the pointer jumping around)...  next thing you know, it 
drops to zero.
i'm assuming it's the actual speedo cable thats messed up.  if so, what can i dto fix it (short of replacing the cable)?

second, my a/c is acting up as well.
when i turn the compressor on, the radiator fan doesn't.  could this be a
pressure problem?  i already ruled out the rad fan relay located in my glove

box....


any thoughts would be very much appreciated.

thanks!