What does the temp gauge represent?

They could read in the negative range for that... in theory.

I bought a new venting cap. The old one was much larger than the "correct" one and was much easier to tighten down and take off. I also picked up a recirculating kit and mounted it near the horns and ran the hose to the bottom of it, rather than to the ground. Still running about the same, and my new gauge was apparently on backorder, so never showed. Now I'm off to find a cheapie and find out what's what.