The RTD temperature probes have been ordered.  I also ordered a few extra normally closed contractor blocks for the panel switches.  These will allow me to setup a safe start interlock for the panel.  I spent the extra money for 25′ of 3/16″ walled 1/2″ ID silicon tubing to avoid any kinking issues.  Finally I am making a home made vent for the boil kettle based on this post.  It will be built from a 30qt stainless steel mixing bowl, a 4″ duct fan, and dryer hose.

auberins.com
3x RTD sensor, 1.5″ probe, 1/2″ NPT thread
1x RTD sensor, 2” probe, weldless fitting
4x NC switch block

amazon.com
1x White silicone tubing, 1/2″ ID, 7/8″ OD, 3/16″  wall, 25′ length
1x VenTech IF4 4″ inline duct fan 190 CFM
1x Stainless steel mixing bowl, 30 quart
1x 4″x8′ flexible duct