While working on my CFI, I was invited to observe an instructor
teaching a primary student in a Cessna 336..a fixed gear center-line
thrust twin. This choice of aircraft simplified things a bit since
hedidn't have to worry about the complexity of retractable gear or
asymmetric thrust. He was, however, limited centerline thrust twin
only.

Seems like doing engine out work during the checkride should earn him a
SEL as well.