Originally Posted by
xrmalin
I've just put a mk4 tank on a mk3 & as far as I can tell the gauge is reading right.
You also need to change the filler neck to suit which ever tank you use along with the fuel cap as a mk3 one doesn't fit a mk4 neck & vise versa.
good point mate.....
which also leads to the top of the neck at the filler cap needing mounting in a different way as ther different sizes/designs (if that makes sense..... open petrol cap and the bit that screws ther is different)