Doug wrote:

Can a CFII give instrument instruction in a tailwheel aircraft if the
CFII does not have a tailwheel rating?

There's no such thing as a tailwheel rating.

Answer is yes. And he can even log it. But you can't go on a filed IFR
cross country flight unless one of you has an IFR rating.

The answer is only a qualified yes. Yes, if it's a single engine.
No, if it's a twin.


Can a pilot who has a complex rating be PIC in an Amphibian if he does
not have a Seaplane rating. (Almost all amphibians are complex).
Yes, so long as he does not land on water.

There's no such thing as a complex rating.