Straight from the manual, make sure the marks line up as shown.

These marks correspond to #1 piston at TDC on the compression/power stroke, and #4 piston at TDC on the exhaust/intake stroke.

Although not "technically" correct, the second set of pictures is mechanically OK, AS LONG AS YOU DON"T INSTALL THE OIL PUMP THIS WAY!

Here, #4 is on the compression stroke, while #1 is on the exhaust stroke

Rotate the crankshaft 360º, and the marks will again line up as in the first pictures.  NOW install the oil pump.