As far as oil pressure and water temp,,160 degrees is 160 degrees whether its in a ford motor or an old 6 cyl. Same with oil pressure,40 lbs is 40 lbs no matter where it is.
pretty much the same with your gas tank,1/2 is 1/2,just use the reducer.

Marty
'54 Panel and '54 5 Window Pick up, in the Gallery
'52 Suburban