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The easiest way to set up the OAG is during the day on a distant object....
Get the imaging camera into best focus then adjust the guide camera to come to focus..
If these are not moved, then they will be in focus for the evening...
Sometimes, there's not enough inward travel on the guide camera tube. In this case you need to add a spacer after the OAG body, between the OAG and the imaging camera, then re-set the guide camera position.
I use Al's reticule with my Lodestar to position the target star on the spectroscope slit....majic!
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