I'm Sorry if this maybe repetetive and i know you may hear or get this asked alot. I have a 1978 280z 2+2 and i know that i will not be upgrading anytime soon to the high flow injectors so i will be sticking to the barb type. i guess what i wanna know is does it make a difference if i want the different size in mm fuel rail or is the barb style just come in one size but with the option of a fuel pressure gauge? and how do i determine if i need or want the gauge? is it a matter of taste/ looks? like i said before im sorry if this repetitive but i am starting to work on my 280z and your fuel rails seem to be the best bang for the buck plus they are getting great reviews across all other forums also. Thanks.