I think I have it figured out. I'm going to add a couple nipples to the P stream line, that way I can measure the water temp and I have room to install the probe. The probe is about 2 inches long and I just don't see a spot on the heads for it. I got to thinking what is it that is being measured? The water temp or the temp of the heads? I assume it's the water temp.
Current Cylinder Index is 42.