Haynes Repair Manual for Villager and Quest has excellent pictures. It covers cars manufactured from 1993 to 2001. Pick one up today at your local parts store.
There is no such part on a Mercury Villager.
yes!
Yes, it should fit.
No, there is no "adjustment".
Buy a manual.
134-a
walmart
4.2 quarts
Powertrain Control Module
1995 Mercury Truck Villager Van 3.0L EFI SOHC 6cylThe Spark Plug Gap.032 (In thousandths of an inch)
No picture, but all thermostats go with the spring side towards the motor. On thermostats I changed, there were words on them and stated which side goes up
Probably about $150 and up.