Well, I got the Insight running again, so its back to this project, yay!
I took a painful ~20 minutes idling my car in the driveway today. The video showed my scangauge and a voltmeter hooked up to the coolant temperature sensor signal off the ECU. I then reviewed the video and threw the numbers into excel. I added another column to calculate the arduino input number I'll get once the arduino reads the voltage for easy programming. After 207F the fan kicked on.
