So, think of it this way, the less that comes with "the kit", the more opportunity you have to do what you want and the added value of the learning experience. For fuel sending units, you have the "option" to use what Vans considers "standard" resistive senders or capacitive senders. The resistive senders have moving parts with a pot. Capacitive senders have no moving parts. We shouldn't tell you which you want. It is your research opportunity to decide for yourself.
Similar deal for the static ports. Of course you have to have a static system, but the parts consist of a pop rivet (that is the port) and some tubing. You don't have to buy the "kit" from Vans, you might just assemble your own parts or buy something else like the SafeAir kit.
You are just starting on a grand adventure that will change your life if you stick with it! Again, Welcome!