New sensor showed up from Amazon. Installed it and ran a test. At first everything looked good, needle on temp gauge was rising as normal. When it hit a certain point it then dropped below the zero. I dug into my settings on the Megasquirt and found the calibration settings for the coolant sensor were off. Probably my fault although I don’t recall changing anything. I did some searching online and found recommended settings for the sensor so did those. Note, these were a little different from the settings associated with the sensor I have in TunerStudio (but not by much). Ran the car after that and saw the same result. Frustration level was high at this point so I stepped away.
Did some more thinking and decided having nothing to lose I would install the coolant temperature sensor I started with. Started her and monitored things via TunerStudio, temperature came up as normal and the gauge followed suit. Went for a short test drive after the static test performing a data log during, and it all seemed fine. I’m going to do some more test driving tomorrow to see if everything is good for my trip.