Today we installed the fuel level sender in the fuel tank - sounds easy but it took most of the day! Stage 1 was to figure out the numbering system as the chart that came with the sender only when down to 180mm deep tanks. The Marlin tank is 160mm. Luckily it was quite an easy one to figure out - 160mm depth, 67mm pivot, 63mm radius.
Next on the list was to make the hole that the send goes in. It was all going well until the dremel (110v 20 odd year old model) finally giving in and died leave the rest of the cut out and clean up to me done by hand. Still turned out quite nicely:
There was a lot of mess in the tank, but luckily one of the vacuum cleaner attachments fits in the hole!
This only leaves figuring out how to attach the fuel hose to the tank and mounting the filter/pump!