Thanks, Gary! That additional explanation really helps. I was thinking that I somehow had to make the vertical line while the gear was still in place, and that was what I was not understanding. So, when someone messes up and pulls the IP gear cover AND the IP and IP gear when changing out the IP, the problem occurs because 1.) the engine is not at TDC so the pump gear could be anywhere in its rotation (and you do not know here it was in that rotation) and 2.) No marks are made to know where the gear was located when pulled. If I am thinking of this correctly then, if pump gear has to be reset in its proper alignment with the cam gear (from pulling the cover and gear with the IP) , the first step in fixing this would be to bring the engine to TDC so that the "Y" of the Cam gear was at least at the top and you might have a chance of seeing it with a mirror and light and not have to pull the front cover. And, you can make the lines on the gear and get it reset properly as you describe.