need help......its time

I think I will Bruce. just hate to keep jacking it up and down on the jack stands. getting too old for that. Thought I would check it before I let it down. if the guage is attached under the tailshaft on the tranny, does it need to go under the nose on the rearend or can it be opposite. I don't have a pinion snubber on it. If it goes on the flat part where the snubber goes, does it have to be on top of the tailshaft. want to get this right.