It's an Autometer I got from Summit when I got all my junk and it's been sitting in the shop collecting dust, then i saw the cage pods and thought itd be pretty funny.
The heaters are in series and I had the small Mojave heater from before. I got the other one and hooked it up to the defrost vents and it works REALLY well. I'm looking forward to a nice and toasty warm winter... soon as I settle on a top.