It is quite possible in a 1996 Mercury Cougar, that when the dashboard instruments all quit at once, there is a fuse that has been blown. Most of the gauges in the dash run off the same fuse in most vehicles.
The gears in the speedometer are stripped. If the odometer is working then you have input.
Replace the instrument cluster.
Most likely a loose connection or bad sensor it is electronic
where is the location of the vehicle speedometer sensor on a 99 Mercury Mountaineer
No, the speedometer is driven electrically from the PCM.
Yes - the vehicle speed sensor (VSS) feeds the data to the speedometer, so if it goes bad, so does the speedometer, odometer, the transmission starts acting real funky, and a myriad of other symptoms. See "Related Questions" below for more about replacing the VSS
Most likely speedometer cable
The speedometer is part of the instrument cluster, and is fused with the other instruments.
Fuse, loose connection, or the light switch. how do you remove the dashboard on a 94 mercury grand marque?
Most likely it is the VSS. Vehicle Speed Sensor. Have it checked out at your local garage or buy a new one and do it yourself. Although a computer check would be preferable first to obtain any codes.
There is no such thing. The odometer is electrically driven from the PCM via the vehicle speed sensor. If the odometer has failed you need to replace the cluster.
The speedometer is part of the instrument cluster, and is fused with the other instruments.