E30 sending unit/fuel gauge

[Tdb1946@xxxxxxx]

fuel gauge on 91 325i displays full constantly. I removed sending unit, 
tested with ohm meter. It indicated proper 3.5 ohm reading at empty, and resistance 
increases as float rises, but max reading at upper float limit is around 58 
ohms. Bentley doesn't say, but old Haynes manual says full tank ohm reading 
should be around 78 ohms. Would this difference in full tank reading confirm a 
bad sender? Seems to me that if resistance readings on lower float positions 
seem to be indicating sender function, fuel gauge indication wouldn't be staying 
on full. Any guidance on this? Any tips on troubleshooting fuel gauge. Thanks.
Tom 
BMW CCA #6710
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