The fuel gauge was totally out. Checking on the FM forum I found a post that explained the resistance range of the Westfield sender is very different to that of the original Mazda. The solution was to put a 120ohm resistor in parallel across the sender contacts. A trip to the local Maplins (D120R - 2W Res 120R are the details) and 29p later I had what was required. Once fitted the gauge read okay. You can see on the right of the fuel sender pictures the resistor in place (before I taped it up).
With the float at the lowest point:
the gauge shows about 1/6 of a tank. It would be great if it were lower but close enough:
With the float at half way:
the gauge reads just under half:
and with the float at the top:
the gauge reads just over full:
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