Chip,
As to this question..
<< So as I see it the question is: is there a new style and an old style
 fuel guage for the Morgan Motor Car? >>
There are at least two different fuel gauges.  My 63 +4 has an "F" series 
sending unit but a later style straight indicator needle fuel gauge.  It's a 
combo that does not work.  As I understand things, the proper gauge for my 
car, with the arrowhead pointer is a very different electrial design from the 
later style gauge.
As to getting your gauge to work with the fuel cell sender, I don't have a 
clue.
Cheers,
Ken Payne
 
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