I too have the extended tanks but my Skysport probes
only go out to the original tank bulkhead. This is the bulkhead that
houses the aileron bell crank.
My experience has been that the tank gauge starts to read
quite quickly. You only have 5 gallons in the extension for a total
capacity of just under 21 usg per side and the dihedral angle which causes the
fuel at the tip to be higher than the inboard end is not so high that it creates
a large dead spot in the gauge reading.
If you are a purist you have to fit the extended probes but it
will not significantly improve the accuracy of the gauges. I had gauge
wiring problems and I wanted to recalibrate the gauges. I filled one tank
up to the filler and set the full trimmer, I then pumped this tank into
the empty tank after setting the low trimmer. What was interesting
was that the when one read 3/4full the other read 1/4 full and this worked at
1/2 and 3/4 going the other way. I concluded fom this that the system was
linear. Incidentally I then set the full probe on the tank I had just
filled and the empty trimmer on the tank I had just emptied and refilled
it. Again the two gauges worked exactly in step.
Up to you of course but for my money I would not bother to
spend money needlessly.
Ian Crowe
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