A while back there was a post about low fuel warning where I said I would post up the kit Kitfox is currently selling once I got mine from them. Nicely done kit indeed.  Every last little washer, tube clamp, ect is included.  Simple one page instructions. $185 Basically you tie into the fuel vent line and add a small tank which is mounted just above the header tank.  Small tank has a float switch.  In theory if fuel in wing tanks is empty or otherwise unavailable, the small added tank will go empty before the header tank and the float switch will activate a panel light. I plan to use the flashing and buzzing type light because the one kitfox sent was a small sinlge led type which I probably would not notice.