there is most likely a censer on one of the wheels of the vehicle
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.
how to fix speedometer for Toyota mr2
I need to fix the odometer and speedometer in a 97 ford explorer
Send to a speedometer repair shop or replace speedometer head
Toyota should recall them, seriously, there have been over 1000 complaints of this same problem on the 2002 Toyota Camry - check google.
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.
By replacing it.
check the fuse
you will have to replace.
spray graphite on it(the cable)
My 89Chevrolet astro van digital speedometer stop working. How do I fix it
Most likely speedometer cable