Fitting of the sender requires you to drill out some fixing holes and do a little filing.
With the idea of swarf getting inside the tank and possibly not being to flush it all out. I came up with a cunning plan! Blue Peter style! all you need is a cable tie, some tape, and a muffin cup.As the tank skin is a nice thickness and stainless, I decided to carefully tap the fixing holes out to 5mm.
The fuel sender was shortened and adjusted to clear the baffles inside. I checked its full range with a multimeter outside and noted its resistance range from full to empty, placed it into the tank still connected to multimeter and rolled the tank to move the float through its range. All matched and nothing fouled.