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![4 Best Boat Speedometers 2020 [Digital GPS and Manual Tachometer]](https://themarinelab.com/wp-content/uploads/2017/12/Boat-Speedometer-e1540220948272.jpg "4 Best Boat Speedometers 2020 [Digital GPS and Manual Tachometer]")
4 Best Boat Speedometers 2020 [Digital GPS and Manual Tachometer]
Speedometer reading about 15-20 mph low - Boat Talk - Chaparral Boats Owners Club
