Temperature guage on manifold?

[Mr Blobby]

Our manifolds have no gauges. 

Which is a bit disappointing as I would be rather interested to see flow and return temps at the manifold.  I can't see any reason not to have temperature guages at the manifolds, am I missing something here?

 

In short, is it a good thing to install some guages at the manifold?  I would have thought it would be useful for commissioning, if nothing else.

[JohnMo]

You can easily add them, I just read the flow and return temps of the heat pump and or performance monitoring.