[whale]

Willy, with the Lowrance unit I highly suggest you invest in the EP-60R fuel flow sensor. For $50 (currently at Cabela's) you will get gallons per hour and miles per gallon when networked to the new unit. You can display this right on the new unit or get a digital gauge (LMF-200 or LMF-400) but for the money the gauge is not really needed. You can display all you need right on the LCX-28C without the standalone gauge. I have the EP-60R with an adaptor connected to the GPS that came with Old School (Lowrance) and I love it. The install is a breeze and connected to the gps you will get mpg in addition to gph. You can't beat it for the price!