Understood. What I started out to do (and still plan on doing) is to have a
device that will stay permanently mounted to the engine that can be
calibrated (adjusted, signed, pick a verb) when the engine is known to be
good and light a "your engine is about to come apart" lamp at the
appropriate time.

What this group seems to be leaning toward is a lab quality device that will
allow for sophisticated diagnostics. That ain't the thrust of my Kitplanes
columns. KISS and BURP.

Jim