I can only see being able to measure flow to radiator, but not what is recircing via the thermastat not being fully open during data gathering. Of course any data would have to specify the car's equipment.
I would think having an orifice monitor radiator flow as a perment gauge could give an indication of caviation at high rpm as temp would increase and flow fall.
I found some test plugs that claim they would allow insertion and removal of pressure of temp probe with system in service
http://www.petersenproducts.co...ure_Petes_Plugs.aspx
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