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.
The gears in the speedometer are stripped. If the odometer is working then you have input.
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.
If the speedometer continues to work - probably a broken gear etc. in speedometer head and probably will have to be replaced. If speedometer does not work -- probably a broken speedometer cable
The speedometer and odometer in a 1999 Mercury Cougar may fail due to issues such as a faulty vehicle speed sensor (VSS), a broken speedometer cable, or a malfunctioning instrument cluster. Additionally, electrical problems, like a poor connection or a blown fuse, could disrupt their operation without triggering a trouble code. If the VSS and cable are functional, the issue may lie within the instrument cluster itself. It's advisable to inspect these components or consult a professional for further diagnosis.
remove dash replace bulb(instrument cluster)
are you sure it is not tail shaft sensor. This would be for your speedometer
Check the speed sensor.
its something ps. i dont know that peps
Check for a blown fuse.
You may need a speed sensor for your 2002 Mercury Cougar if you experience issues such as erratic speedometer readings, the speedometer not working at all, or transmission shifting problems. Additionally, if the check engine light is illuminated and diagnostic trouble codes related to the vehicle speed sensor are present, it could indicate a malfunction. A visual inspection of the sensor for damage or disconnection can also help determine if replacement is necessary.
cougar 1989 no lighting in dash instruments or speedometer. Where do I look for an open circuit. Fuses all checked good.
The gears inside the odometer broke due to heat and age. You can buy the gears and replace them yourself. Or you can take your car to a place were they work on odometers.