[TR] TR3 fuel sending unit impedance

[William C. Quincy]

I have a question regarding a '60 TR3 and the fuel sending unit, when  
I connect the fuel gauge it is pegged to full, upon disconnecting the  
wire from the sending unit it drops to E. When I measure the  
impedance of the sending unit, with the tank empty it shows 82 Ohms.  
I would like to know what the sending unit should measure when empty  
and full, so I have some idea where to go with this problem,  
additionally any other information regarding this problem would be  
appriciated.
Thanks