Honda Supra GTR150 2020 Owner's Manual page 21

Speedometer
Gear position indicator
Shows 1st to 6th gear position.
u"-" appears when the transmission
is not shifted properly.
Fuel gauge
Remaining fuel when only 1st (E)
segment starts flashing:
approximately 1.54 litres (0.406 US gal,
0.338 Imp gal)
If the fuel gauge indicator flashes in
a repeat pattern or turns off:
(P79)
17