Sierra 781-579-035P Amega Series GPS SpeedometerFeatures: Dial Range: 0-35 MPH; Sender Code: GPS Receiver; Size: 3"; Included LCD heading display to show course over ground; Use our GPS antenna (sold sep) or connect to an existing NMEA 0183 GPS device - connectors included; Speed accuracy of +/-1 MPH (once moving); Heading accuracy of +/-1 degree (once moving); Ideal for slow speed apps like pontoon boats and for high speed performance boats w/ pitot tubes; Black dial, red graduations, white numerals, vivid white pointer staff; Scratch resistant curved glass lens, with black near-flush bezels; U.S. and metric scales; Perimeter and thru-dial lighting; Optional add-on eyebrow or square bezels available (see Gauge Accessories for details); Voltage: 12 VDC; Current Draw: 0.15 - 0.20 A; Operating Temperature: -40C to +70C; Ingress Protection: IP 65; Bezel O.D.: 3.78; Housing O.D.: 3.39; Hole Size: 3.43;