Fuel Gauge Inop

Fellow "A" body maintainers,
Racking my cranium trying to figure out this fuel gauge anomaly. Needle moves ever so slightly to just above the "E". Here's what I've accomplished:
- Installed new tank/sending unit and got that slight movement above "E"
-grounded power lead at tank and gauge will peg out to full and return to empty. That tells me wiring up thru the instrument cluster is good.
-Removed sending unit. Rheostat ohmed good from empty to full. 3ohms to 84 ohms
-With unit out of tank...

Fuel Gauge Inop
Author: Zak