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In regards to FE instrumentation, on a usefulness scale from 0 to 10, considering a scangauge being 10, how would you rate a combination of a/f ratio meter, closed loop monitor and vacuum gauge?
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Narrowband AFR meters are completely worthless.
Wideband AFR meters are highly valuable if you know how to interpret and manipulate the output.
For a fuel meter, I'd rate the SG at a 7. The other things you mentioned, the SG already does, so there's not much need for discrete components.