Thanks. The temperature probes are in the locations recommended by Blichmann. It is on a welded NPT fitting on the pot on the HLT. For the mashtun, it is on the pump output. I considered putting it right before the return port on the MLT, but was a little concerned about it getting cooked by the heat from the burners and also noticed that the pump output is where Blichmann suggests putting it. Because his controllers are designed to overshoot a bit, I think they may be designed for a slight bit of temp loss on the return.
As for two controllers, no, you don't need them. I probably didn't need either of them. But as for the HLT controller, I have a tendency to let my sparge water burner go too long when I'm doing other things during the mash. Since I was installing one, I figured it would be easier to just install two. Don't have to pull the drill out twice. It wasn't inexpensive, but I got a little bonus at work and went for it. For me, it was better to get it done all at once.
Here's a better picture with the wiring cleaned up.
As for two controllers, no, you don't need them. I probably didn't need either of them. But as for the HLT controller, I have a tendency to let my sparge water burner go too long when I'm doing other things during the mash. Since I was installing one, I figured it would be easier to just install two. Don't have to pull the drill out twice. It wasn't inexpensive, but I got a little bonus at work and went for it. For me, it was better to get it done all at once.
Here's a better picture with the wiring cleaned up.