I bought the exact same regulator last week.Looks real nice but I haven't connected mine up yet because I'm waiting on the exact same needle valve you just got lol.
$80 dollars is a bargain for a pressurized co2 system and if you follow the easy plans to OD lights that you have posted(I did
)a person could have an awesome aquarium for minimal investment.Assuming they do all the other important things of course.Which I admit I'm still learning and have a looong ways to go still.
Pancake