I'd suggest you take the car to a speedometer repair specialist. They can remove, repair and calibrate the spedometer.
check your fuses
10w30.
buy a new horn and install it
Good luck, I've got the same issue
$600.00 to $1000.00
V6 3.8 liter.
Try going to "autoaccessories4less.com.
Exactly what problems are occurring?
Mounted on top and inside the fuel tank.
To fix the speedometer on a 1991 Oldsmobile 88, first check the speedometer cable for any breaks or disconnections, as a damaged cable is a common issue. If the cable is intact, inspect the speedometer itself for any signs of malfunction or wear. You may also need to check the vehicle's vehicle speed sensor (VSS) if equipped, as a faulty sensor can affect the speedometer's accuracy. If these components are functioning properly, consider consulting a professional mechanic for further diagnosis or replacement of the speedometer unit.
under the throttle body next to the thermosat housing.
What is and where is the soft seal located?