1. Suitable for all vehicles, boats and off-road vehicles<br> 2. The signal comes directly from the satellite signal receiver(GPS Speed Sensor)<br> 3. The gauge has the advantages of high precision, quick location confirmation and short start up time.<br> 4. IP67 waterproof and dustproof grade<br> 5. Stepper motors used for full range of stepping gauges, great feature with its less power consumption, longer life, higher precision, etc.<br> Fixing dimension: 85mm(3-3/8 inch)<br> Backlight: 7 Color<br> installation :<br> 1.Turn it on, then the to search the signal and LCD will display "gps-",if there is still no GPS signal after three minute, LCD displays "Err".<br> 2.Short press the button to change the backlight color: Backlight changed in sequence: red (default) - green - blue - white - yellow - cyan - Purple - (automatic).Automatic: Automatically switch the backlight color every 20 seconds, Cycle switch according to the above sequence.<br> Wiring<br> 1 Black: Ground(-)<br> 2 Red: 9-30VDC<br> 3 Yellow: Backlight<br> Indicating Range: 0-60 mile<br> Model: CX8133<br> Material:Stainless steel + plastic<br> colour:Silver<br> Package Contents:<br> 1 * GPS speedometer<br> 1 * GPS antenna<br> Only the above package content, other products are not included.<br> Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.