Here are pictures of mine:
T Splitter, under the air cleaner, I used the vacuum line that is on it's way to a sensor.
Here is the Vacuum Arrestor that I got at NAPA to take the jiggle out of my gauge
Here is where I went through the firewall, that boot was pretty tough to get through, so I just went above it. There isn't much strain on the plastic, not too worried about it rubbing through. Might still add a piece of rubber fuel line over it to prevent eventual abrasion