i just installed a new apexi el mechanical boost gauge and when i took it for a burn to see if it worked it was reaing .5bar too much, like it was reading 1.3 bar instead of .8 bar.is this because i have chosen the wrong hose to tap my boost line into?i thought it wouldnt matter what one i used if it was comign out of the intake plenum.any help would be greatly appreciated.