Fortunately, John at Vertical Power found the problem -- it was, in fact, the cable I made. He upgraded the unit, and is sending it back, with a new cable, too. You can't beat that service with a stick!
As it turned out, it's just as well I had to pull the system out and send it down to Albuquerque for some professional help. I made some changes in the system's location, moving it closer to the center of the subpanel assembly to move it away from a wiring run. And I also changed the way it's mounted, adding some nutplates so that it now screws into the brackets that hold it in place, rather than bolt it in place. And I added a nutplate or two to put some Adel clamps on the brackets to assist in some wiring runs.

In the meantime, I determined that the Grand Rapids EIS 4000 isn't going to provide the visible fuel level monitoring that I want (although it will provide flow rate information, which is possibly more valuable), so I ordered an Electronics International dual fuel level indicator (about $400) for the panel, instead. And having the VP-50 system out will make it easier to drill the holes in the panel to insert it.
Plus it has pretty colored lights.
Glad for the update, it was like a season cliffhanger I tell ya!
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