I’ve nearly completed the wiring of the instrument panel.  Plan to do a 100% pin by pin ring test of all connections.  Ordered several yellow #6 hole crimp lugs that I will use to tie the panel ground to a common point.  The ground for the engine monitoring display will be tied back to engine ground.  Wiring included connecting all of the wires to the panel side and engine side connectors and pulling in the main wiring harness.