Awesome quality product. Have installed 2 systems in my boats myself...years of troublefree priceless info, and accurate to 1 gallon on 100 gallons in my last boat for 7 years for me. Will be doing install to 496 HO's myself early spring. It's really a very straightforward install. I think there's only 7 wires...just need to buy enough insulated multi-conductor cable to go from engine room to instrument location. I will never be without one in a boat for long. There are many useful ways you'll use the info!