Disregard. I figured it out. I found via a Jeep Cherokee complaint somewhere, that that car had to be driven something like 25mph for over 3 minutes for the temp to update. So I drove down to the freeway, and sure enough after at least 1-2 minutes up to speed, it updated accurately. Guess they shut off while idling or going slow? Which makes sense. Sensor is up near the grill so probably gets all hot while idling.