Welcome to the wonderful world of Auto Repair. Technicians get the same kind of information many times. The sad part is it isn't always correct. Off the top of my head I don't know where your particular flasher is, but I would say if the info you have is correct, it is up under the dash and may require various components. To start with you should have a flsher on hand so you know what you are looking for. (webmaster-please don't edit my answer except for this sentence)
inside the gas tank
On a 1996 Mercury Cougar : In the fuse panel under the drivers side of the dash : ( there is a 20 amp fuse , the panel is marked " CIGARLTR" )
The evaporator emission system control valve on the 1996 Mercury Cougar is located on the left side of the car. It is in the passenger side headlight area.
Flashers are next to the fuses in the fuse box under the dash.
According to the 1996 Mercury Cougar Owner Guide : ( 18.0 US. gallons )
There isn't any fuse then is linked to the alternator on a 1996 Mercury cougar. The alternator has an internal regulator, but does not have a fuse.
I can't say for sure , but the ( 1996 ) Mercury Cougar is ( 18.0 US. gallons ) * also the 1991 Mercury Cougar is 19.0 US. gallons
The ( 1996 ) Mercury Cougar gas tank capacity is ( 18.0 U.S. gallons )
Look at the lower rear end of engine - follow cable from starter solenoid
A ( 1996 ) Mercury Cougar gas tank capacity is ( 18.0 U.S. gallons )
The firing order of the 1996 Mercury Cougar is 1, 3, 7, 2, 6, 5, 4, 8. This is for the 4.6 Liter engine.
The 1996 Mercury Cougar OBD 2 port is under passenger side dash above glove box
The Temperature Control Module is located at the center of the instrument panel......
On the left side of the steering column there is a light black tab that you pull down.
According to the 1996 Mercury Cougar Owner Guide : ( 18.0 US. gallons / 68.1 liters )
1996 mercury 2.8 liter engine V-6. What is the firing order? 1,4,2,5,3,6
The 1996 Mercury Cougar door panel is held in place by eight retaining clips into screws. Remove the screws. Pry outward on each retaining clip.
I believe it is in your glove compartment there is an access to your flasher.
The speed sensor is located on the back of the transmission, right before you get to the drive shaft you will see it sticking out.
6 x 8
According to one of Fords websites : For the 4.6 liter V8 engine in a 1996 Mercury Cougar , the spark plugs are gapped at ( .054 inch ) * confirm with the Vehicle Emissions Control Information ( VECI ) decal located in the front of your engine compartment