"S" off / No bars

[obsolete]

during "power up procedure" part 3 (pre-cranking), the yellow "water level" light comes on but the "S" and "W Inj" lights do not. If i wait until the water level light dims, when I crank (start) the engine, the "S" lights up for the duration of cranking. The guage bargraph test does nothing. I get no bars at any point. The 100% injection test and the test drive (with injector pointed at windshield) both worked out fine aside from the guage showing nothing more than a flickering water level light.

I've checked all the rj-45 connectors and all pins seem fine, everything is plugged in fully. The guage connector is mirrored as it should be.

What to check next?

Thanks in advance.