I bought a Hummingbird fish finder this year. When I installed it I must have installed the transducer to low cause I would get a rooster tail. So i rised the transducer which stopped the tail but now I get a crazy read out at full speed. Any ideas would help.

Did you install the roostertail plug in the mount??

Nope didnt know anything about it, but i do now. I guess ill lower it back down and try that plug? Thanks

I have used the plug, but l inadvertently lost it while repositioning the transducer.  So I taped the hole shut with Gorilla tape last year and it has worked fine ever since.  H'bird sent the plug at no charge (I love their customer support), but the tape works well.  Like I said, it has been a year with the tape and no problems, so recommend the tape while waiting for your plug to arrive.