Hi Karl,
1. I did not have that switch, and I had a single voltmeter that read bus voltage. I wanted to be able to see the various voltages to know what’s going on with the electrical system, so that’s how I designed the layout and configuration.
2. I used the EI fuel sensors recommended for my installation. I have yet to fly the plane, but my IA has run the engines and said everything was working fine.
I hope this helps.
Rick
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