Well as far as the gear shift indicator goes; as you move the gear shift
lever, there is a piece of nylon string attached to the steering column
that pulls the indicator needle into position. it retracts with a spring
acting against the string. When you drop the steering column, you can see
the string and if the string is attached, then look for a broken or
disconnected spring by the indicator.
As far as your shuddering problem goes, you could have worn suspension
parts specifically ball joints in your front end. Also look for anything
broken like a section of the frame and check your stablizer bar bushings.