Nice! It's a good meter...I just got my flow meter... From what I understand, I have to take my bubble counter and remove the needle valve. Install that at the top of the flow meter and attach the bottom of the flow meter to the regulator. Correct?
What does the knob on the flow meter adjust if I have to use the needle valve anyway?
If I want to turn the top block around, is just a matter of removing the screws, lifting it off and turning it around? Will there be gaskets etc that I need to be careful of?
Yes, you have it right. The meter does have a good quality valve, but - assuming yours is exactly the same as mine (does it have a letter printed on it?) - its adjustments are too coarse for the flow range you need.
flipping the top block isn't hard, and there aren't any pieces that are going to fall off or shoot out at you when you remove it. The trickiest bit is keeping the tube in place while you put it all back together.