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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.
remove dash replace bulb(instrument cluster)
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
are you sure it is not tail shaft sensor. This would be for your speedometer
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.
Trouble code P0731 means:Gear 1 incorrect ratio
On a 2000 Mercury Cougar : The brake fluid reservoir is also used as the clutch fluid reservoir
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.
Mercury Cougar was created in 1967.
most odometer will need be repair by expert who cal odometer or replace the total meter