Dan Truesdell wrote:

Thanks for the heads-up on those. I was figuring on about $2K, but $4K
would mean asking the other 4 owners to kick in $1000 for an item that
they won't use. For a 172, it's probably just as good then to get a
manifold-driven backup vacuum. Too bad the electronic AI's are not
certified for IFR (the $1500 ones, not the $6000 ones.)

One of our club airplanes has something like this. But someone told me that
it works least well under full throttle...which means down low executing a
missed approach.

Was I told correctly? How serious is "least well"?

- Andrew