@Kennedy the Dawes and Needle Valve are for the the 3L Di and CRD motors

EGT gauge supposedly you get a more accurate reading from the exhaust manifold and the max temp can be higher on that side. Most have it fitted to the dump pipe just after the turbo. If your dump pipe doesn't have a port then you can either get someone to weld the port on, or take your dump pipe off and then drill a hole and tap a thread in it.

You can just see mine here in this picture

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