Maule Driver wrote:
I have the precise flight setup. I've never had to use it but, my sense
is that the vacuum failure light may be the most valusable component.

The light is good if you don't have one.

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Directed to the OP (I'm sure MD knows this):
If you go with the Precise Flight, be sure you check the shuttle valve
frequently as described for preflight in the POH Supplement. The shuttle
valve can stick and then when you need it, it doesn't work. Just the act
of checking it causes the valve to operate and probably helps keep it
from sticking.

Also be sure you understand the operating limitations - altitudes and
power settings where it works and doesn't.