Hey guys, I have been reading the reviews of the AK900 on here for a while now as well as doing other research and I am looking into purchasing one. I have a couple of questions for you guys that have experience with these. What is the best place to purchase them from? Should I get the one with the manifold included, or purchase a different manifold? If a different manifold, would a standard YJ41 work? (As in are the two holes on the top of the manifold spaced properly or will I have to get some type of adapters?) Do they have to be calibrated prior to each use? I am definitely going to purchase the spring temp clamps, but, are there any other temp probes that I should purchase as well? I know this is a lot of questions, but I would appreciate your taking the time to respond. Thanks a lot guys.