One of ours has died and Maule cannot source a replacement. They have offered to try to repair it which involves shipping it from here in the UK. Does anyone happen to know please where such a gauge might be found? The aeroplane is on G registration so an airworthiness release is required (8130 in FAA speak, Form 1 in CAA or EASA speak).
Yes, thank you,

For myself, I rely on looking in the tank before flight and doing arithmetic in my head (plus at age fifty-six neither my muscles nor my bladder want to fly for more than half the full tank endurance of the aeroplane anyway

Thanks
Joe