John,

Well, its taken me a while, but I think I finally figured out why this won't work. I was assuming you're use of the phrase "earlier 140" in your original post referred to your 140. But after rereading, I see it refers to before 1974, which is the year of the other tank you have to use. So, I'm pretty sure the car you need to replace the tank on is a 1973, which means it has the later instrument cluster and a different fuel gauge from the earlier 140s. Based on that, unfortunately, you're absolutely correct, there is no correct sender. To use the 1968 tank, you'd need the flange from the 1st version sender and the "guts" from a 3rd version sender, though I'd be extremely surprised if it'd actually be possible to successfully put such a thing together. That, or swap out the dash so you could have the earlier instrument cluster, which I'm fairly certain is not a realistic option.

Sorry. Best of luck coming up with a workable solution and I hope you enjoy your stay while here in the US!

Stan