one or more fuses blown
a dead battery
A worn or frayed speedometer cable will make the speedometer shouter. As the speedometer cable becomes more frayed the speedometer will eventually quit working.
speed regulator sensor needs replacement
If the ABS light is flashing it means the system is malfunctioning but still working. The dash light behind the speedometer is burnt out.
Your speedometer may have failed, or the speedometer cable that connects to the transmission, or the plastic gear in the transmission may be broken.
Trans output speed sensor.
Yes , I BELIEVE the last year for a speedometer cable on a Ford Explorer was the 1995 model year so the 1991 Ford Ranger would definitely have a speedometer cable
The wiper blades need to be cleaned.
On a 1995 Ford Ranger : The ODOMETER is near the center of your speedometer
1996 ranger does not have speedo cable it is electronic
The 1999 Ford Ranger pickup truck speedometer sensor diagram can be obtained from most Ford dealerships. The speedometer sensor diagram can also be found at most auto-parts stores.
http://www.therangerstation.com/tech_library/Speedogear.html