If you mean - "where is it", follow the dip stick down to the bottom of the engine and detremine which pan it goes to (this will be the oil pan). Find the plug on that pan. If you mean - "how do I remove a plug that is stuck and won't come out with a socket or closed end wrench", I would offer two options: (1) vice grips, if the problem is that the hex bolt has rounded corners. (2) drill through the center of the bolt with increasingly larger diameter drill bits until you approach the threads. Then use pliers/vice grips to turn the bolt if possible, or, simply crush the remaining bolt material and work it out of the pan. In either case, replace the bolt and don't overtighten. In an extreme case, it may be necessary to remove the oil pan to work on the oil plug.
.54 is the gap on the tracer
where is the transmission fill on the mercury tracer
The 1999 Mercury Tracer was the last model year in North America ( according to one of Fords websites , .054 inch is the spark plug gap on the 1999 Mercury Tracer )
Auto: fill through dipstick tube Std. Plug at side of transmission - fill to this level
On a 1997 Mercury Tracer : firewall 1-----2-----3-----4 front of vehicle > driver
0.054
0.054
The radiator Petcock is located on the Driverside of the radiator at the bottom, if you remove the splash guard you should be able to see it.
.054 gap
The gap should be .052-.056
According to one of Ford's websites : For the 1.9 liter four cylinder engine in a 1994 Mercury Tracer : ( the spark plug gap is .054 inch )
Follow the plug wires and they will go to the distributor cap.