Well, at least we know your engine is turning the right way ! Thermostats have given me problems more times than I like to admit. Often times mine will seem stuck and it really does scare the sh*t outta me when I look over and see the needle moving up past 200*, only to see it drop back down after it reaches something like 220+*! I chased that one for awhile and thought I was buying junky t-stats, but new ones never seemed to make any difference. Last time I bought one it was a bit hotter, I'm not sure, but I believe stock, is 185*, the one I got is 195, but hey, it was winter at the time. I don't have any over-heating issues in the summer, but if anything, that may make it run a bit lean...I haven't replaced it over a year-n-half. I just put up with it not opening sooner.
As far as getting the stock gauge to work, you would probably need to test the temperature sending unit on the housing, I think it only has one wire. I'm not sure if that is the problem but it's a good place to start. Back a few years ago, I had no fsm, but I somehow came to the conclusion that mine was DOA, so that's why I decided to go mechanical. Actually, I'm not sure if the fsm details how to, My PC was hit with a virus and a lot of stuff is missing now that it has been revived.
I can't imagine why the blades would be angled the opposite way, but if it is blowing air the right direction...