The fuel gauge issue is an interesting one. I've flown a (small) variety of light single and twin aircraft both as an instructor and for post-maintenance flight tests etc. The fuel gauges have varied from reasonable (eg DA40/DA42 with capacitance gauges) through adequate (eg my own GY80, graduated in 1/4 tank marks and accurate to roughly that level) to appalling - worst I've ever used are the ones fitted as standard to our fleet of new Cirrus SR20s. They're not too bad when down to minimum fuel but otherwise lie constantly. What would the actual situation be with these legally in Canada? Over here the requirement is for them to read 0 when the electrics are off...