Looks like fuel gauge sender might not be worth it based on that thread.

After looking at the thread about fuel hose clamps I'm thinking a small fire extinguisher for the passenger foot well might be nice.

Maybe thumb screws for the trunk liner.

Then there's the sound dampening. Ken Shapiro had a good thread with some pictures on that. Not sure if he ever put dinamat under the seat, or if I missed that part, but there were other sound dampening measures.