I agree with Keo. While they might fit nice and match the 'factory' look there are a few things that (for me) would be a downer.
You have to use the factory sensors for one point, the boost pressure isn't in any reading format that is commonly used (mmHg), plus the readings are in metric not imperial (so you need to know the conversion) and they should be used for indication only and not as a *really* accurate gauge (unless you're OK with that).
Could easily sink the money into something better i rekon.