The key to presenting to management is keeping it short and to the point. The topics you need to cover are cost, benefit, time to implement. Everything else are details that they probably don't really care about. Except the charts. Managers like charts.
We used to take an hour to do demos for our software. Along the way we trimmed out nearly all of the actual technical stuff, leaving just the parts showing how it's going to make their lives easier. Demos now take about 15 minutes and sales are up. Every so often we run into those highly technical people that want the details and we'll gladly dive into them.
Show some nicely formatted reports with pie charts and graphs. Cover the benefit and implementation time frames. Go over how your product pays for itself in X number of months/years/whatever. Keep the presentation down to 30 minutes; 20 is better.
If a manager is disinterested, then that amount of time doesn't feel like a complete waste. If a manager is interested (s)he will likely start asking questions while forgetting about how long you guys are talking. Make sure you give concise answers.