I found that the problem is the MMDC. Since all the gauges were out, it had to be either a fuse or the MMDC. I checked the voltage and there was power on either side of the 3 AMP fuse for the MMDC. I'm calling my dealer tomorrow but I'm expecting to get a nice bill for one of these boxes through Mastercraft. Does anyone know a supplier for this Medallion device? See attached.
I've seen a few on ebay but they have a different model number and seem to be for Malibu.