Re: Speedometer Problem
Hi John, look under the dash and see if the back of the unit has a rubber hose connected to the middle, if it's a rubber hose then you have what I call a vacuum speedo, as the boat moves through the water the water passing the pick-up unit creates a vacuum in the rubber hose which causes the speedo needle to move just like an engine vacuuum guage. The pickup unit is mounted on the bottom of the transom. The problem could be a split/cracked/disconnected hose, a dirty/clogged pick-up unit especially if you boat in salt water. That's where I would start looking. Good luck,,,
