I'll pass on this to the list for future reference. On installing the
sender -  I tried using graphite on the O-ring as recommended in the
Bently but had no sucess.  I even removed all the paint I had sprayed on
in the sender seating area, but still no sucess.  Finally, I lubed the
both sides (inside and outside) on the tank where sender seats and the
sender with liquid dish soap.  Not only does it hold the O-ring in place,
but now the sender installed with (relative) ease.  I plan to lube the
gromets that the breather pipes fit into the tank with dishsoap as well.

John