Jim and Becky wrote:

For some reason when two aluminum tanks were installed just three
years ago,
they chose not to put fuel guage senders in.
So now I need to install them.
snip

Why bother, it is very tough to beat a stick.

As someone who sells and applies level measurement instruments, I'll
be using a stick.

Why a stick?

Because it is reliable.

Difficult to say the same for instruments on a small boat (100 ft or
less) without spending some very serious money.

Ask the US Navy when they install level measurement instruments on
their vessels.

Lew