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

[Waterloo]

(04-18-2018 )74bassman Wrote:  Would that also be the reason I haven't seen the temp on the screen?

It could be, or possibly something else, will have to look at the schematics. The wiring on these things is right out of a bad Frankenstein movie. Your ABS and Jake run through your compass, no telling what the temp sensor runs through... Probably the blinker fluid control unit. ;-)