Here’s a pic of the pair of Spartans off of #1388. Have no reason to believe that are not original, and only 12 cars different than your #1400. Someday I’ll put em back on🙄
I just replaced the sender in my ‘63 a few months ago. Was ordered from SI and worked beautifully. The bolt pattern is specific to an orientation. Seems like the float was pointing toward the right side…