Stop looking. It doesn't have one. Villagers did not have OBDII (with data plug access) until 1996.
OBDII plugs are under the dash to the right of the steering column.
inside the fuse box at the bottom
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According to one of Ford's websites : The spark plug gap for a 1993 Mercury Villager , 3.0 V6 is : ( .032 inch )
1995 Mercury Truck Villager Van 3.0L EFI SOHC 6cylThe Spark Plug Gap.032 (In thousandths of an inch)
The distributor in a Mercury Villager is the round thing at the front of the engine with the six spark plug wires attached to it.
According to fordparts.com the spark plug gap is ( .032 inch ) on a 1993 Mercury Villager with the 3.0 liter V6
Plug in a scan tool.
Both the Owner Guide and fordparts.com show ( .034 inch ) spark plug gap for a 1998 Mercury Villager 3.0 liter V6 engine
I was looking at the 1998 Mercury Villager Owner Guide ( and one of the Ford websites ) and they both show the spark plug gap as ( .034 inch )
There is no such thing on this vehicle.