Gig 601XL Builder wrote:

Which brings up a very interesting question. I'm building a plane that will
be licensed as an Experimental. Once inspected I'll have to test fly for 40
hours for phase one. If I use a Hobbs as the official time and hook it to
the MS I would probably end up reducing the phase one time considerably.


That is interesting. Does the FAA specify tach vs. oil pressure Hobbs,
vs. electric Hobbs?

Think of how many pilot logbooks are based on electric Hobbs time.