Followup: Used both the UMA tach sender and picked up off one P-lead using a 100K ohm resistor and it works just fine. In fact, everything works except the Kavilco fuel pressure sender. Won't move off 0 psi, so after double checking everything, it's on it's way back to Dynon for testing and hopefully replacement. It's supposed to read 4 psi even with the engine not running, so something is wrong. The smoke test was successful and the biggest problem was flooding the engine trying to test that fuel pressure sender. Now I have a bunch of programming to do, but plenty of time to do it (and put the panel back together) while I wait on the fuel pressure sender. Since this is/was a flying airplane, I'm in a bit more of a hurry than a builder might be.
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