anyone have an idea what torque that sender should be?

Nope, but it's in a thin metal plate, so I wouldn't use a 1/2" drive breaker bar to tighten it. My answer....."just tight enough not to leak".

Hey, whadda ya want for Sat morning?

Barely any torque. New copper crush washers, right?

too much torque, and youll find out why they call it the taco plate