fuel gauge sending unit access 1991 180 br/ob

[rleague]

I'm new to the sr world and have a question concerning how to get to the fuel sending unit. My gauge only reads a touch off empty with 14 gallons of gas. I just bought this boat and need all the help I can get. I've looked for access panels to no avail. I've replaced the gauge already but no luck.

Any help would be greatly appreciated