You may well find that if you cross in Swiss airspace, they won't let you go into the Class C whose base is FL130 in places (was last time I looked). So you have to fly fairly close to the terrain. That's what I ended up doing on
this trip in 2004.
One EGT gauge is good enough as it allows you to fly the constant-EGT climb profile, where you note the EGT after takeoff, and then gradually lean throughout the climb, keeping that value constant-ish. Some notes
here (search for
constant-EGT method).