It is warning you that your seat belt isn't fastened.
As long as it returns to the normal range when the engine is running, it's no big deal. Some gauges will read zero when the ignition is on, but the car isn't running... and some will max out. (like yours I'm guessing)
The ignition switch is where you insert your key to start car
Not sure on a zx2. On an Escort LX it is behind the fuse box in the engine compartment.
The ignition switch is in the steering column..that's where you insert the key to start the vehicle.
This is something that is almost impossible. If this is happening on your Ford Escort you have some serious wiring problems.
ask your local car thief
There won't be a relay for the ignition. You may have a "blown" fuse.
The ignition module is mounted to the side of the distributor. It a rectangular piece.
Yes, originally the door and ignition keys are the same. but if you have to replace your ignition / steering column, you will have a different (re-keyed) key for the door and for the ignition.
The cooling fan is supposed to keep running as long as the coolant is over temperature. If it runs too long, it could be the temperature sensor or a stuck relay. If the relay has become magnetized or fused, you need to replace it.
No
No , it's a Distributorless Ignition System