If the fuel tank was made by Florida Marine Tanks, their label will be on the tank near the fuel tank level gauge. FMT has moved to Henderson, North Carolina. They have a website at---wait, you won't believe the URL---
https://floridamarinetanks.comMy 1990 REVENGE 22 W-T Whaler Drive boat has an OEM tank made by Florida Marine Tanks. I expect your 1985 REVENGE 22 will also have an FMT tank.
Read about replacement of a fuel tank for a similar boat at
https://continuouswave.com/forum/viewto ... f=6&t=5518and at
https://continuouswave.com/forum/viewto ... 505#p32017I would expect a 77-gallon replacement tank of OEM quality will now be about $3,000.
There are many prior discussions about replacement of fuel tanks. You can search for these archived discussions in either the new or old forum. A search form is provided at
https://continuouswave.com/whaler/search.htmlAfter you read ten or 15 old discussion, if you have any remaining questions, you can raise them here.