Wheel rattle

[Bruce G Plante <Bruce.G.Plante-1@tc.umn.edu>]

I have a 87 5kSQ with 150k.  I am back with several problems I need advise on.  

1)Combination switch(turn signal) will not go out of high beam.  Recommended
vendor quoted $150 for new. Curious if there are any out there for cheaper,
any other suggestions (currently using rubber band attached to the light
switch), and if this a job for a do it your selfer.
 
2)Rear Passenger wheel makes a hell of racket bouncing on this years snow
packed roads.  Original suspension parts on the car.  Doesn't appear to have
any play in the wheel or  neither does the car bounce after I press my
weight on the rear bumper and release (it goes up and then stops).  Could it
be some bushing that has worn out?

3)Ohdometer has stopped working.  Is this easy to replace and how?

Thank you in advance for your help.
Bruce in Minneapolis