spray graphite on it(the cable)
You can fix the speedometer in your 1994 Oldsmobile 98 by replacing the speedometer cable. If changing the speedometer cable does not fix your speedometer you will need to replace the entire speedometer.
I'd suggest you take the car to a speedometer repair specialist. They can remove, repair and calibrate the spedometer.
=A Gage is gun a 12 gage=
You might have to take the car to a certified speedometer repair shop
how to fix speedometer for Toyota mr2
May have to take the car to a certified speedometer repair shop
Speedometer can determine a car's normal and maximum speed.
I need to fix the odometer and speedometer in a 97 ford explorer
Send to a speedometer repair shop or replace speedometer head
Sounds like a sensor
You need to start by having your car checked for codes. You can then fix the cause. It will probably have to do with a speed sensor.
If the speedometer is not working it probably needs a new speedometer cable. If the speedometer is actually broken either take it to as speedometer repair shop or replace it.