Fuel Flow Sensor with 10' cable T-connector 54168 Fuel Flow Sensor Gasoline ONLY. 1 required per engine. Up to 3 engines supported. Outputs: Fuel Flow Tank Fuel Used Trip Fuel Used Seasonal Fuel Used Cable Length: 10' Fuel Line Diameter: 3/8" (9.5mm) Inside Diameter Flow Rate Measured: Optimized for 0.6-45 Gal/hr but can measure outside these values Added Back Pressure to the fuel system: 0.5 PSI at 20 Gal/hr; 1 PSI at 40 Gal/hr Installation Location: Above the max level of the fuel tank, in-line after the fuel filter and any Y's or T's in the line Package: The Fuel Flow Sensor, N2K T and 2 (two) 1" hose clamps Fuel Type: Gasoline only. The Fuel Flow Sensor does not operate diesel engine fuel systems Hole required to route through a bulkhead: 22mm (7/8") Multiple Fule Flow sensors possible: Yes