Lq9 swap wiring help needed

[fast&low]

Hello guys & thank you for looking & your time.
Ok before I start with the questions this is an lq9/4L65e swap into my 1969 C10 & I'm also doing the update kit from American autowire.
Not new to the update kit but very new to the ls swap so plz be patient with me.
#1 Gray wire to fuel pump:What gage wire is recommend? (Just to run from motor to underbed gas tank?)
#2 purple brake pedal switch wire: Do I Connect this up to my brown brake light switch wire?
#3 Purple wire cranking signal:What do I connect this to?
#4 My classic update wiring kit from American autowire has a purple wire with a white stripe called VSS power what is this for I can't remember & it's Sunday so there closed today & I'm trying to get this done.
Thank you guys I hope I said it rt my brain is fried rt now with all these wires lol.
Miguel Stevens