Hi,
We've been exactly in the same situation couple of years ago with our C172 project:
http://www.lentosimulaattori.1g.fi/k...t+panel/33.jpg
http://www.lentosimulaattori.com/index-eng.html
Like already said below, the main problem with the real C172 instrument panel is that the yoke shaft goes through the panel and there's no this kind of LCD in the market.
We have been using Simkits gauges and also have had the typical problems with them like calibration issues etc. I would definitely go for double LCD style panels now if I would start new project. More flying and much less problems.
Also Meridians solution is a great way to do it. Only few Simkits or similar analague servo gauges and the rest of the 'sixpack' with LCD. There are already flat enough pulse encoders to control the gauges. Check out for example this Finnish project:
http://mik.1g.fi/kuvat/Kerhon%20kalu..._4209.jpg/full
Feel free to ask more:
robots@jippii.fi