Bought brand-new in 2011, excellent secondhand condition. Series 9500 GPS Interface System incorporates a digital LCD Engine Hour Meter, Tachometer, Fuel Flowmeter, Fuel Totalizer and maritime Miles Per Gallon over the ground in a single 3-3/8" diameter instrument which fits the panel area of a conventional tachometer. The speed signal needed to determine the nMPG reading is obtained from GPS and Loran systems having a NMEA 0183 serial port output. Even more info on this item can be discovered on the floscan.com internet site Series 9 GPS Interface System single engine (U.S.) Everything is in excellent working order. The outflow can was dented by the removal of the engine and the brackets have a thin coat of 5200 on one side, both revealed in the pictures. Includes installation guidelines.