My UltraGauge tells me the blue light goes off at 52°C. Never less, never more.
I guess both are pretty accurate 
Your suggestion is a good one though. I am happy with my UltraGauge.
I monitor intake air temp, coolant temp, instant FE, engine load, 12V battery voltage and something I forgot, gotta look
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
Last edited by RedDevil; 06-19-2015 at 03:33 PM..
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