Tim,
The P-lead terminal is the threaded portion just to the right of the yellow label visible above.... if you look closely, you can see a threaded hole at 45 degrees to the right and above of the P-lead connection that takes a screw for the ground wire.
Note - the hardware is missing in the picture.... there is an insulated phenolic washer under the P-lead ring terminal, as well as metal washers and lock washers....
The picture also shows the Slick Timing Pin inserted to set the mag at it's timing point for installation.
gil A