Now that you are educated on test indicators you can go ahead and reinstall the main oil pump and the VANOS high pressure pump, working backward from steps #36 to #31.
Make sure to lube the chain tensioner piston parts and install them into their bore before installing the main oil pump gear. I used medium strength threadlock on the pump gear nut.
You can torque the main oil pump bolts but leave the VANOS pump bolts just snug. You are going to want the bolts tight enough to allow the VANOS pump to be able to be moved when tapped with a rubber or plastic mallet, but not able to be moved by hand.
Start by setting the VANOS pump to a position where you can feel a very small amount of free play when trying to rotate the sprocket back and forth, then snug the bolts as stated in the previous paragraph.
Install your test indicator so that its mount is rigid and the indicator can easily reach the gear, then position it as follows:
Proper position of the indicator and the indicators measuring arm is critical for obtaining accurate measurements.
As shown in the next picture, the face of the indicator needs to be perpendicular to the sides of the gear, not perpendicular to the gear tooth. If you measure with the indicator positioned perpendicular to the gear tooth you will end up with a measurement that is the lash value times the cosine of the gear tooth helical angle. This value will be less than the actual value you are looking for.
The indicators measuring arm needs to point at the center of the gear. In other words, if you visualize a line through the center of the measuring arm, and extended outward, it would intersect the center point of the gear. The arm can be at any angle with respect to the indicator body, but must be pointed at the center of the gear.