EGT, or Exhaust gas temp. gauge is a very important tool to have on a boosted car. putting it in different places can alter the readings. the best place to put it is about 2 inches away from the head on the 3rd runner of the manifold. Why? #3 is ALWAYS the hottest cylinder. 1+4 are more surrounded by water than 2+3 are, an because of firing order, 3 is hotter than 2.