1. 3M 5200 sealant.
2. Not I.
4. Is the pickup the issue or is it the ballast tube that's the problem. If the former, just buy a replacement pickup and enjoy. I like a good analog speedo to compliment SG. Especially useful in river current.
Previous: 1993 Prostar 205
Red 1998 Ski Nautique, PCM GT40, 310 hp, , Acme 4 blade, Perfect Pass SG/Zbox.
Be kind. Have fun.