I have a 94 alumacraft v17 phantom. The speedo used to work fine but couple weeks ago, it just didn't kick in while on the go. I've check the plastic thing at the rear of boat and there's no clog. Also checked behind the speedo gauge where the tube plugs in, and it was loose and there's little droplets of moisture (water?). I plugged it back in and hope that was the problem, but nope. The RPM gauge still works. Anybody want to shine in on this? Thanks.