valve

Im about to put in a set of injectors and an air dog 165 i think..havent made up my mind on what pump yet..anyway this is the first time the truck has been torn into since it was new..I was thinking that with the high miles I was going to do a compresson test and check the valves to make sure...

I just got my PPE boost valve and was wondering if im suppost to put it before or after my boost gauge, my boost gauge reads inbetween the housing and wastegate, and i dont know if itll read either way or what? let me know what you guys think. Heres a picture:

Does anyone know the intake and exhaust valve lash adjustment spec?