1974 18' CC fuel tank sending unit

[mikeyk]

I've searched posts but can't seem to find any information. I need to replace a faulty sending unit. Can it be accessed by de-caulking and removing the 6"x6" access plate under the front of the console seat?
Or should I prepare myself to pull off the console and lift off the entire tank lid. Just praying the last time the cover was serviced they didn't use 5200 .
Maybe someone has done this before and measured x,y coordinates on the lid where I can hole saw access to the sender?
Thanks