Ruby Fuel Tank Sender Unit Problems

[Mick Hanna]

In the hope you might notice this, Dave T, could you tell me the diameter of the access panel you cut to reach the fuel sender unit, please? I need to examine mine to sort out a fuel gauge that doesn't register more than half a tank. Lying on my back beneath the car and trying to remove those screws on top wears me out just thinking about it. I've marked out as best I can where a hole needs to be cut in the floor-pan beneath the rear seat squab, but I'm wondering how wide it should be to be workable?