Use a .5 feeler gauge for the TR Spark Plug Gap.
.035
.5 / .6
0.70mm
45 to 60 thousands,
.042
.050
45
1.08mm OR .042"
0.039 to 0.043 is the gap tom_dee2002@yahoo.com
On a 1994 F 150 , 5.0 L ( 302 cubic inch V8 ) the spark plug gap is .054 inch ( according to www.motorcraft.com )
Remove the spark plug wire. Using a 5/8" spark plug socket with appropriate extension and driver unscrew the spark plug and remove it. The spark plug gap should be set to .045". Replace spark plug and reattach wire.