Hey Dan, to address your item #3 and possibly #2. If you look at my build thread post #118, https://thefactoryfiveforum.com/show...Rod-1028/page2, we have the result of troubleshooting this issue. If you look up the Autometer instructions, you will find that you will use the last hookup option for the instruments https://www.autometer.com/media/manual/2650-1164.pdf its the last diagram on the PDF. Here is a pic of the back of all the connections we ended up have using the Autometer gauges.
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I have a 2013 5L Coyote with a TKO 600 as well so the setup should be very similar. There may just be a slight different setup on the ECM that's all.