this is what i recommend too, though mine are in different locations, i have the first 3 under my deck and the wideband gauge where the left vent was in the center above the HVAC controls. i put them there because i hate the look of pillar mounted gauges.
and yes i put my boost gauge in before my turbo, i am a bad person. a bad person who is always too busy on other cars to work on his own :mad: