Ok here's what I have so far:
1. with key ON, test for power at harness-side connector brown/black wire
12.6V
2. with key ON, test for power at gauge-side connector brown wire
12.3V
3. measure resistance between chassis-ground and harness-side connector black/yellow wire
.2
4. measure resistance between chassis-ground and gauge-side connector black/yellow wire
.3
unplug ECU connector
5. measure resistance between ECU-connector black wire and harness-side connector black wire
.3
6. measure resistance between ECU-connector black wire and guage-side connector black wire
.3
7. measure resistance between ECU-connector black wire and chassis-ground
3.7
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