are guages neccessary?

i'm gonna be baggin my accord w/in the next 3 weeks...i'm gonna be runnin cans w/ 1/2" line and 3/8" smc valves...if i am runnin a 110-145 pressure switch, do i need guages?

do i need them cuz the cans can only go to a max of 145 w/ this set up? rite?

either way i am gonna add them later, but since it is my first setup, i would like to install it a.s.a.p. rather than wait to figure out how to work them into my dash( i hate dirty installs)....

thanks for the help fellas...

oh yea...if i can, and do add them later, will i just be able to splice them into the line w/out having to rework my valve fittings and what not...

thanks again