omegaboost

ok so my steering rack has a loose and now its time to change it. i know the 97+ has some kind of variable steering or something like that which highers oil pressure for a tigher feel and is an upgrade of a 95-96. If im right, theres also a solenoid to get in order to make things work right? I tried searching around but didnt find much so my question is, since i wanna do an upgrade, was else do i need besides the steering rack to make things works?

I already saw Kevlo's thread, the install isnt a problem, i just dont wanna be missing anything.