Check for a blown fuse.
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 gages in a 2000 Mercury Cougar at not working, it is likely that a fuse is blown. While the chance is slim, there could also be a wiring harness malfunction.
Check fuses under dashboard, driver side.
They might be broken, check with a mechanic, its illegal to drive when they are broken.
There are certain car gauges which are mandatory to have in a dashboard. These gauges are the speedometer, the temperature gauge, the fuel gauge, the tachometer, oil pressure gauge, charging system gauge, and odometer.
what do you mean? did they stop working, work now and then, or what is working and what not? if everthing is dead and the truck runs ok, then ckeck the fuses, but im not sure at all it could be PCM related.
You probably have a short in your abs system which has blown your fuse try pulling the fuse. This happened in my 2000 sunfire and I pulled the fuse and all the gauges work now.
check the fuse panel and the fuses
It's that part in front of the driver with the lights and gauges, radio, glove compartment, etc.
There are several reasons why a gas gauge could stop working. A short in the wire from the sending unit could be the culprit. The computer that controls the dashboard gauges could be going out.
Bad light bulbs.... Replace them...