Hopefully you got the digital gauge. I started out with the "Classic" analog style, but after two tach's and one spedo died I switched over to digital style. They're uglier and much harder to read, but they work well and provide more info.
Why not just ask dealer for the old gages back if you just want to plug the holes?! Or you can get 2" gauges for the I-Command system, from either BRP or Lowrance, that would also fill those holes. I was surprised to learn that there are some parameters that cannot be displayed on the big gauge. Not at home now or I would check to be sure, but I believe engine trim position and Throttle Position Sensor readings can only be seen on the small gauges. I have 2 large and 2 small gauges and use them all.
BTW, as a new E-Tec owner, you should check out this great "CSC quality"
owners group web site if you haven't already seen it! Lots of good info there from some very knowledgeable techs! Denny