Hi all. repair question.
 

Hi all. I am a new 91 Mariah MX19 boat owner. But not new to boats. Boat history. She is a 91 mx19 and i am the 3rd owner. I did the cardinal sin of buying the boat without getting to put it in the water before buying. It.wouldnt start for the previous owner... so, i replaced the starter, fixed the issue... so the boat runs great,, i have had it out 3 times and the last time we went out the speedo wouldnt work. I took off the tube to the speedo and to the back of the drive and blew it out. Is there anything else i should do begore going back out in it? Also is there anything i can do to fix cracks in the gel coat on the top of the boat?