Dress White 4 GPS Speedometer - 60 MPHPerimeter-lighted White dial with bold Black graphics, White aluminum bezel, contoured Black pointer and flat glass lens.The GPS Speedometer is a drop in replacement for your current speedometer to match your existing instrument dash.GPS information is gathered from an internal GPS antenna. No external antenna required. The Faria GPS Speedometer uses a highly accurate 48 channel GPS receiver. You can be sure that the Faria GPS Speedometer is giving you the most accurate GPS information available on the market today.Course Over Ground (COG) and actual heading (compass heading over ground) are displayed on the optional digital LCD.Speed data is shown by an analog pointer. This pointer is driven by a digital stepper motor for increased accuracy and minimized pointer bounce during vessel operation.4 - Hole Size: 3.375 (85mm)Features:Anti-scratch glass lens12 VDC negative groundCan be adapted for 24 VDC systemsDual Scale - Imperial and MetricFactory P/N SGP111*Sold as an Individual**Gauge Cover not Included