I used the boost gauge also on torque now the boost i am weary about but a boost gauge was install and remove and the both torque and the boost gauge was very close 19.5 on gauge 19.7/20 on torque on a 30 degree night 19.1 on a 70 degree day,and this is with a 17lb pulley which appears odd.I do after the nw manifold dcai and high flow filters.