You should focus on the basics. Replace any seacocks that show corrosion problems. Check engine and rigging. The instrumentation can wait. Get a portable GPS, it will give the best value for the money and you can use it on and off the boat.
You should be able to fix the tank with some straps. Something must have broken - fixing that would be the natural way to repair.
Get a metal worker to fix the pultpit. For that kind of money you will have plenty of work to do. The main thing is to keep her afloat.
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Oh salsus mare!
quantus vestri salis
est lacrima Portucalis