I found the Ambient Air Temp Sensor! 2008 ProStar...

[Waterloo]

Brock, YEP! One wire of two had black electrical tape on it, I spliced in down at the bumper, using weatherproof connectors https://amzn.to/2VbLCKH and ran it up to the cowl... The truck is night and day, at least going up to the the corner for beer and Camels. On a day like this, it would be reading around 90 to 100 degrees F... It was 81, and that is what the dash board showed. A first, and the truck was purring. No clue, just saying, something happened, and it was GOOD.