UPDATE
So, I got the sender unit repaired. New plate and resistor wire done here in Perth WA at Speedline instruments.
Now, I drained the tank just enough to thrown the unit back in, put 20 odd liters in it and the gauge came up off the E mark to about 1/5 or 1/4 approx.... Happy days, or so I thought.....
Then off to the petrol station and filled her up, it took another 20 litres. At my estimation that's probably some where just short of 50 litres, Now without Gregorys guide I cannot remember the ke38 tank capacity, but I'm guessing its dam near full and i couldn't get anymore in it at the pump.
Now my bloody gauge is ready just over half. For me its ready exactly half a tank less than whats in there.... ANY ideas why ?