I'd like to use my stock gauge for my belly tank under my
sliding door, it would seem to follow that I would need to
use a stock vanagon sending unit in order for the gauge to
operate properly.

Firstly, would there be a difference in the gas gauges
between a syncro and a 2wd van? The senders themselves are
different, but would the gauge properly read input from
either the 2WD or syncro sender?

Secondly, what kind of depth range does the 2WD and syncro
sender have? The belly tank is 5" deep.

Thanks,
Chris