EPR or N1?

[Guest 777workingtogether]

Good afternoon,Just one thing I noticed. This isn't a nitpick or complaint, more of a 777 question I'm curious about. The T7 panel has N1 as the top gauge on the engine display (as do many triple sevens), however, I was browsing airliners.net and found that Engine Pressure Ratio (EPR) was the top gauge followed by N1. Can someone explain why this is? Is this an airline preference? I've linked to pictures below to illustrate what I'm talking about.Thanks,Jonhttp://www.airliners.net/open.file?id=902470http://www.airliners.net/open.file?id=865880

[pbenoit 0]

N1 is the primary engine measurement for GE engines ... which are modeled in the PSS a/c ... EPR is the prime measurement for Pratt and Whitney and Rolls Royce engines ...So that's what you see ... N1

[Guest 777workingtogether]

Well that makes an enormous amount of sense. Thanks for the info!-Jon