If you can put a ScanGauge (or maybe an UltraGauge??) in it you should be able to read engine temp digitally.
My Civic also doesn't cool the coolant much when at idle speed. I think that's pretty standard with an engine-driven pump.
Sorry I can't try interpret the temp sensor data. Radiator's return hose should feel cooler than the upper hose, definitely.
The fans definitely put a load on the alternator and thus on the engine. I avoid any setup that causes my (single) fan to run a lot. That definitely affects your fuel economy.
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Coast long and prosper.
Driving '00 Honda Insight, acquired Feb 2016.
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