There is a "mark" on the splined part of the injection pump that has to be lined up with the mark on the bearing cap when the injection pump is installed into the block. The engine has to be at 24 before TDC. The engine book goes onto say that if it is a Bosch injection pump code number "251" (November 1982) the mark for begin of delivery may be applied to the wrong spot on the bearing cap. It goes onto provide details of how to set it up if it has this code number if anyone needs it let me know. I have tried to get a photo showing the marks lined up on the IP.
The drip tube method works fine for me.

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Jim