Yes in the manifold would be best but slightly more difficult than in the intake piping before the TB. i thought about in the intake but i didnt want to chance messing it up, and i figure depending on where in the intake manifold could change temp aslo, like say if the turbo is sitting at the #4&5 it may be warmer there. Probably wouldnt make much of a difference, but i also wanted the inake to be clean looking, thats why i am going to get rid of most things on it. JMEAD, choose which ever one you want and good luck. Oh, yeah, you can use the GM sensor for coolant temp (TSU81 at advance auto that costs like $8) but you have to tap the whole for i belive 3/8NPT which is just slightly larger.