If you don't use the City Water connection, the Shurflo faucet from West
Marine (WM model #296493, MFG part # 94-009-10, $40) makes a nice
replacement.  It appears (to me) to be better built and is smoother working
than the Delta unit.  It's easy to install, requiring only the fabrication
of a simple adapter from a couple of washers and some gasket material to
secure the smaller faucet mounting in the slightly larger hole in the sink.
 I've had one for several years and it still works great.

There is no provision for a City Water connection, only a switch and valve
for the On-board water supply.  Use the original Westfalia water pump.  The
faucet swivels back and forth in addition to up and down.  The nozzle also
twists right and left.

Ed