Originally Posted by FredR

Another approach is to put a paint mark on the crank damper to index the position of the plug.

With regard to your filling procedure I am somewhat puzzled as to how you attached/removed the hose without spuilling ATF when the sump is filled correctly given when the motor is switched off the contents of the torque converter flow back into the sump and that floods the reservoir- logic suggests the only way one can do this is with the engine running. I trust you are aware that there is a fitting close to that reservoir to achieve this objective- it is designed to work with a quick fit coupling that can also be utilised by slipping an appropriately sized hose [3/8th inch?] over the fitting. Of course if your method works for you all well and good.