Putting fuel tank back on - fuel line, vacuum lines - KZ1000p

Hopefully a couple of simple questions.
It was a long time ago that I took the fuel tank off and got the carbs rebuilt. Of course I didn't take pictures (doh!) so something as simple as putting the tank back on seems challenging. I know how to physically put the tank on but my question is the vacuum / gas lines from the tank to carbs, etc.

On the carbs, I believe the #1 carb and the #4 carb are joined by a vacuum line and tee'd in to a vacuum line going forward on the bike.
The 3rd carb vacuum end is plugged with black plastic which I believe is correct.

So ...
Does the #2 carb vacuum line goes to the petcock?
I assume the gas line on the back of #2 carb goes to the petcock?
Where does the vacuum line by the fuel level indicator go?
Where does the vacuum line at the back of the fuel tank go?

Thanks for any insight.

You are correct on #1 and #4.
#3 is plugged
#2 goes to the petcock.
That is not a vacuum line coming from the sending unit. It's a drain that is routed on the right side of the bike and ends near the swingarm.
The nipple on the back of the tank is an overflow/drain as well and is routed along the left side in the same way.