The $’s depends a lot on your location.
I am in South West Canada and I paid $175 CDN for a nice original ’59 Fisherman with a good pressure tank and owners manual. The coils,points and condensers had been replaced with original OMC parts which alone are worth $100.00 + . Found it on Craigslist and it turned out I knew the seller . I’d done some work for his son in law many years ago.
Like ddWilson says, Pressure tanks work fine if all the seals and o rings are good. Never had a problem.
