To answer your Q. In all my years I have only seen one that had a slight drip.
Tube fracture or fitting failure ?
I ain't for sure (many years ago), it was a slight drip right behind the brass fitting at the gauge. X2 what Dave said, T into the port & add (or keep) an idiot light & use a sender that turns on higher than the OE ones, 15 maybe 20 psi.
live every 24 hour block of time like it's your last day on earth
