Ideal for the exhaust temp is in the exhaust manifold just before the turbo to get the highest readings most people that I have seen put it in the rear half of the manifold. The boost can be measured in a couple of different places at the turbo or at the intake manifold Piers Diesel Research has a bolt that make's it pretty easy to install in the manifold. I get my reading off the wastegate line at the turbo. On a 12V there is a couple of ports that have plugs in them on the manifold, one is behind the injection pump fairly easy to get plug out and install fitting.
Craig