Finished the 2nd nutplate along the top edge of the FW recess, for the oil pressure hose clamps.
Removed the original CHT probe from cyl #4, and inserted a couple of the cyl head probes from the Dynon EMS sensor package. The threaded cyl head insert is threaded longer than the original, and has a slot to tighten. A good large flat blade screwdriver needed. The actual temperature probe is a bayonet connector on a spring cable. At 1st glance there would be insufficient force on the bayonet to prevent it from practically falling out. Will have to confirm but it appears to require a very long portion of the probe 'above' the bayonet to ensure a strong spring force secures the bayonet from twisting.
Need to determine if any thread lock is appropriate, too. Only inserted #2 and #4 tonight.