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I dont know, maybe its me, but either psi or level seems it would vary with water content in the fluid as well as the vehicle location to sea level.
How about measuring temp at the t stat to get a better reading or cylinder 1 where coolant typically enters an engine? I use to work in a machine shop and cylinder 1 was always the least distorted and the last cylinder where the fluid exited was the most distorted.
On many cars the temp sensor is either on the other side of the t stat or the throttle body. In many cases it the t stat can fail and your sg2 or analog gauge says cold.
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