I spent most of the day working, but I had a little time so I snuck out to the garage for a bit. I cleaned up some of the wire runs and installed the wire from the starter contactor to the VP-X so that I’ll get a “starter engaged” annunciation on the EFIS.
I put a 1kΩ resistor inline with the wire. Unfortunately, I didn’t see the note that this was to protect the wire and should be close to the contactor, so I’ll have to replace this wire.