Thanks guys. I shouldnt admit to this, but I actually flew the P68B after a 1.3 hr checkout and wasnt aware of this. I have just been comparing my photos with a Duchess I also flew. Now that really pisses me off that my instructor never emphatically pointed this out. I have kept the questionaire I did at the time and I see now I wrote down left engine as being the critical but the instructor never checked the thing. Makes me wonder what other things one might miss. At least I know I will never be unsure about critical engines now.