The Omega is a bit fussy, though I did just plumb it into the loop with Chevette heatercore and I am now taking deltaP measurements. It fluctuates though (as I am sure you recall) I am guessing with the pump's cycling? So I am looking at the inch H2O reading for the outlet of the radiator fluctuate; won't that make it a bit of a challenge to accurately assign flow rates from the deltaP?
It's not trivial to write them down as fast as they fluctuate even...
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