I assume it's working and you just want to check the calibration of the speedometer. I recommend you use a GPS to check it since those devices have a speed indicator included in their many features.
If your speedometer is indicating zero when the car is moving, you likely need a new speedometer. If it's reading zero when the car is moving, try clapping the dash above the instrument to see if the speedometer moves off zero. If it does, then you 100% need a new one. If it doesn't, then you 90% need a new one because you have about a 10%chance that it's the car's speed sensor which might be in the transmission. Not a big deal ($) that, the bigger deal ($$$) would be the speedometer itself.
check the wiring to the speedometer. Check the sending unit as well. If the problem is internal then the speedometer will have to be replaced.
did you check the speedometer gear in the tranny?
If the Park Ave is a year that uses a speedometer cable, check that the drive gear for the cable is working. Check the cable to insure that it is not broken of stuck, then check the speedometer itself. These steps will let you know what is broken so that you can fix it.
To fix the speedometer on a 1991 Capri non-turbo, first check the speedometer cable for any damage or disconnection. If the cable is intact, inspect the speedometer itself for any signs of failure. You may need to replace the speedometer cable or the speedometer gauge if they are faulty. Additionally, check the vehicle's transmission speed sensor, as issues there can also affect speedometer performance.
check the fuse
check the fuse, the speedometer does not run off of a fuse
If it's an analog speedometer, first check the condition of the speedometer cable. It may need to be replaced.
If a 1992 Honda Civic's speedometer is erratic, the problem could be the speedometer cable. It could also be the speedometer sensor malfunctioning. Check both components carefully.
Find a road with a "measured mile" and check it.
check fuses
If the speedometer breaks, it effects the odometer. Check the speedometer cable it may be broken, even under the insulation.
check your speedometer sensor located back left of engine bay on top of the transmission