I have recentley purchased a fuel sending unit for my 1974 280c. The old one was erratic, innacurate, and sometimes the low fuel light would not come on. The replacement part arrived today, and on the side of the unit it says Attention: remove safety pin before installation. There seems to be only one thing they can be talking about. At the bottom of the unit which is cylindrical in shape in the center is a small spanner style nut. This nut is also incased in a plastic sleeve. It has a blob of green paint on it. Is this the afore mentioned pin, and if so, how does one remove it with oout damage.
Also, how hard is it to replace the tank fuel screen? looks like a bear to me on a car this old.