Hi Sir,
We are supplier of Instrument Gauge for Marine.
Recommend our 85mm LCD GPS Speedometer to you.
* No Need Speed Sensor/No Stationery Drift
* GPS Blind Area Odometer Compensation
* OverSpeed Buzzer Alarm
* Switch unit between MPH, Knots and Km/h
* Trip Counter, Total Mileage Adjustable
* IP67 Waterproof, Salt-proof
Would you like to have some samples to test?
Welcome to visit our Booth: 5.2K127 at  Automechanika Shanghai Show
Time: Nov 30th.~Dec 3rd, 2016
Best regards,
Tenet Auto Electronics Ltd. 
Tel: +86-755-82591445
Whatsapp/Mobile: +86 18320789937 
Email: niki@tenet.com.hk
Skype: tenet.instrument2 
Web: www.tenet.com.hk