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In addition to sealing the four through bolts that anchor the console to the floor, you can do the following. Reseal all instruments that are mounted in the console. Steering wheel bezel, tach, light switches, hour meters, etc. See if you can retie all wires from instruments, motor controls, etc. so that they have a downward hanging loop or U shape in them before they enter the pipe that passes through the deck to the berth area. For the engine control cables that enter through the plexiglas side, open the opposite side, use duct tape to seal off as many holes as possible on the inside, then use black silicone to fill in all the holes on the outside, pushing lightly around the cables and against the duct tape to bed it well with no voids. Smooth with a finger dipped in soap solution and it will be not be noticeable but will prevent any water ingress along those control cables. I went a step further. I put a strip of self adhesive 1/8th inch foam tape on the inside of plexiglas panels before screwing them on. And finally, I put a bead of silicone around the bottom edges of the console where it meets the cockpti deck on the front and both sides, but left the rear side open for any possible need to drain if the previous measures fail. Since doing the above about five years ago, I've had no leaks during rains or once per week washings. Hope this helps.
Regards... -Gaz