Nope. As per manufacturers instructions the sniffer was wired directly
to the batteries. I guess I could put a fuse (10A, 15A?) in there, but
then I guess if/when fuse goes the sniffer will silently stop working.
Unless I wire up a separate on/off switch as per Matt's suggestion and
verified I get a "test beep" when sniffer powers on.

I'm thinking the next boat may have a kerosene stove...

- Ari