Aussie_Horizon_190 wrote:
Pitot tube speedos are notoriously inaccurate at lower speeds - you simply do not get enough water pressure to move the needle. Below about 20kph (10 knots) mine is fairly useless, so I always use my GPS for measuring speed - fast or slow it's always accurate.
Do you know if you can test the speedo on the trailer just to make sure its working. Like, turning on engine and putting pressure on the back sensor. Will the cause the speedo to move / speed up? Just wondering because my speedo didn't work out in the water.