Ford Ranger Owner's Manual page 67

Check the engine's oil level, following the instructions on
3.
checking and adding engine oil. Refer to Engine oil in the
Index. If you do not follow these instructions, you or others
could be injured. To assure an accurate reading, your vehicle
should be on level ground.
If the level is low, add only as much oil as necessary before
4.
you start the engine again. Do not overfill. Do not operate
the engine if the pointer is below the NORMAL band,
regardless of the oil level. Contact your nearest dealer for
further service actions.
Engine oil pressure gauge — mechanical cluster
Engine oil pressure gauge — mechanical cluster with tachometer
66