tnsteele.....The SilverLeaf Program reads directly from your diagnostic port under your dash. It's connected directly to the engine computer and reads EXACTLY what the engne computer is seeing. The ScanGauge is nice, but it doesn't have the features of the SilverLeaf program.
You can download the SilverLeaf Program for free and play with the different style gauges and design your own screen layout. If you like it, you buy their cable that connects your diagnostic port to your laptop. The cable is about $300.00.
You can also buy a premade SilverLeaf box that mounts on your dash, but they're pricey.....about $1500.00.
Here is what I did with mine. I bought a small notebook computer and mounted it on my dash. Look closely at the gauges I have displayed. They're what I want to see, but there are a bunch more. You can also select several styles of gauges with preset alarms. My gauge goes red and make an audible alarm if my coolant temp gets above 210 degrees.
Your DutchStar came with the old style Allison shift panel that only has one window and shows what gear you've asked for. The SilverLeaf program allows you to run a gauge with two Allison windows, like the newer versions.