If you will go to http://www.pbase.com/agamid/image/122333416
you will find a picture of a March pump. On the label, just to the right of the connection "diagram", you will see arrows pointing up and down with the word "OIL". The arrows point to the two oiling ports which appear, respectively, as a silvery U at the top of the motor (just below the transition from metal to plastic) and as an inverted U at the bottom of the motor. If you have an older unit the label may be different or worn away bit it is these two semicircular apertures on the side opposite to where the wires enter that you seek.