i don't believe you have gotten an answer to your Q about how to mount a water temp probe. take my simple idea:
slip a 1/4" piece of tubing over the center of either a brass coupler or a piece of copper piping. cut your waterline (where you want to mount the probe) & use that coupler to splice the tubing back together. slip the tubes on flush to the 1/4" piece, pry up the 1/4" piece with a screwdriver, & slip your probe underneath it. this way the metal will stay at the temp of the water & the probe will stay insulated from case air.
i used this method on my rig & get very reliable readings, a solid seal, & almost zero impedance to waterflow. looks pro too;~)
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