Hi Will,
If I were to chose two engine backup instruments, I would think about what is
required
to keep the engine running. In all cases, fuel and in many cases, electric
(for the fuel pump or turbo control on a 914). So I would look for some
sort of backup fuel gauge and a volt meter or ammeter to be aware of the state
of the battery. If the engine keeps running, and you have an iPad or similar
GPS device or charts, you can probably complete your flight and you can
certainly
get to a nearby airport.
Jim
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