What you need, is a wiring schematic, to find out how the gauges get powered through the instrument panel harness. The gauges need both power and input from the sending unit to work. FW used to have them on their website under customer service and owners manuals. See if they are still there. I bet that the power lead for the gauges is not hooked up, the lights work but you are not getting any readings.
I have one for my old boat but its too small to read easily, but I can see that the lighting, and power to the gauges, is from a connector that plugs into the engine harness. Sorry I can't be more helpful, your boat is a lot newer and might be wired totally differently. You need an instrument wiring schematic to see where it ties into the engine harness. You sure you plugged everything in?
Found it, take a look, see if you can figure it out......
page 133
http://www.fourwinns.com/upload/Documen ... orizon.pdfI learned how to read one of these many years ago (1973/4 to be exact) when had to re-wire my VW powered Dune Buggy (first car). It was a little confusing at first but I figured it out. Boy those cars were REALLY simple.