+ DUAL (2) Bright Displays showing GPH, all the time. Brand-X’s FP-5L has one LCD display, (gray on gray) showing either-or type situation FP-5L/FP-5 is NOT TSO’d, display turns black at TSO temperatures. FS-450 passed TSO-C44b and Operated at -67 °F to +180 ‘9F + FAA TSO for Reliability and Accuracy, a 3 year warranty. + Talks to all GPS’s including Garmins 430/530 and all handheld’s etc. Displays gallons required to next waypoint or destination at no additional cost. FP-5L does not report “gallons to destination”. FP-5L does not work with a “handheld” GPS. + Programmable display for Gallons, Pounds, Liters. No imperial gallons . + Remote “Warning Light” programmable with Low fuel and low time warning. + Automatically calculates K- factor for excellent 1% accuracy + Return line systems (Pressure Carburetor) and gravity flow, no problem. + Clock size, 1.5″ deep, 3 1/8″ hole, 5.0 oz. wt., Transducer 3 oz. wt. • TSO’d for use in turbo-prop aircraft. + When your, El, Hoskins, or Shadin fails upgrade it to destination an FS-450 using old transducer. + Automatic reminder (flashing digits) to update Fuel added. Fuel added Can be set after take-off not possible with the FP-5L/FP-5 + “USED” Total fuel used can be set to zero at any time during flight. + Twin and Single FS-450M instrument. + %HP Calculated on fuel burn. + Timer included