New gas tank

All good points, so just adding on -Starting at the end of 73SB's list-

#1 issue I see is that ground strap across the rubber fuel line. I don't think a week goes by that somebody doesn't post a guage problem related to that.

If re-using, there are posts on here how to check your sending unit electrically. Be sure the screen is good and not ready to fall apart.

I would definitely get a new tank/neck seal. Not sure if yours is the same, but I got one for my '75 from the dealer within the last couple years for under $15.

I mixed my old gas 50/50 with fresh and used it in the lawn mower.

Take the neck out first and put back after the tank is strapped up with seal already in tank.. A little tranny fluid or vaseline works to lube the grommet for easier install. Don't forget the wear pad between tank and body. Originals were tar paper. I used a sheet of roofing rubber on mine.