Well putting in the interior is pretty simple, what exactly are you having problems with?
You can get a new dash from Year One or Performance Years as well as anything else you might want. You can get any aftermarket gauge to work in your car with the proper sending unit, buying a VDO gauge set will get you all you need. You can pick up VDO gauges from almost anywhere, summit, Jegs and thousands of other places. If you have a specific question let me know, glad to help.