Problem with using it in light aircraft is that you need an accurate enough fuel gauge
You need a) the departure FOB and b) the fuel flow.
a) is easy.
b) is not so easy, but can be established by e.g. doing two identical flights which have different length cruise sections. Fill up before and after each flight and then you can work out your fuel flow in cruise. Assuming of course you lean equally in both cases.
The fuel gauges are actually irrelevant. Mine happen to be very accurate (expensive capacitive type) but I use them only for switching tanks. When flying solo I run down the LHS tank by about 1/4" on the gauge, to keep the plane flying straight.
It is critical to know the
progress of the flight in terms of fuel.