Quickie Q2 Lite Construction Manual - page 226
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The fuel gauge consists of a direct reading float type mounted
near the centerline of the aircraft. Before installing the gauge
permanently, you should make sure that it will not interfere with the
elevator control rod CS13 which runs from the control stick to
elevators.
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A length of 1/4" wood dowel obtained from a hardware store is
bonded with epoxy into a carved urethane foam float nominally 1"
diameter by 1.25" high. This float assembly will float up and down
with the fuel level. It rides inside a clear PVC pipe tube that you
will calibrate with marks showing fuel quantity. Some points to
remember are that the wood dowel should extend about 1.5" above the
top of the main fuel tank, that the length of the clear PVC pipe is
governed by the travel of the wood dowel, and that the float assembly
should be fitted to the fuel tank prior to mounting the fuel tank in
the fuselage permanently.