Power Booster Install questions

[Flatbed136]

Swapped out the manual brakes on my 68 C20 with a power system and have a few questions.

On the threaded rod that attaches to the brake pedal, how far should the piece with the hole in it be screwed in or how many threads should be exposed?

For example, when I pulled the manual linkage off, there were only 3 threads showing from the top of the nut to the rod its self.

On the brake light switch:

Will turning the adjustment nuts to the right bring it down to the pedal?

Don't mean to try and beat a dead horse but I didn't find what I was looking for in the two pages of post I looked through.

The brakes work well and it sure beats the manual but I don't think I have the piece screwed on to the rod far enough to be deemed safe so wanted to double check. The way it is now, there are quite a few threads showing.

Thanks