I'm still waiting on some parts to setup calibration of my electronic otterstat. So I wrote software that checks the 12 volts. It will warn the user if the 12 volt (car power) drops below 12.5 volts for one second by sounding 5 beeps from the "buzzer". I do that just in case your alternator belt breaks which would quickly over heat the engine. I only do that warning once just in case your alternator goes bad you would not want that constant beeping. But it looks like the temperature gauge sender responds very quickly anyway but if you get a warning a few seconds earlier all the better to let you pull off the road sooner.

I will also warn the user if the unit detects higher temps than normal. The user will set the fan on switch point and I will use that setting plus some yet to be determined increase to warn the user. I'm guessing about an 1/8 of a gauge increase to set that warning. Will probably keep that warning sounding.