the 15amp next to the empty slot should be 7.5amp, its for the radiator fan. the empty slot is for the "backup" fuse, should be 7.5a, I'm guessing thats superseded by the in-line fuse. If so, it should join a red wire at some point. That seems to be backup power to the display if the signalling fuse blows. Other than the 15a which should be 7.5a the fuse values look reasonable.
Assuming the inline fuse is the backup fuse, one end should lead to a red, which ends up going to the display. The other end shares a connection to the ignition key, the rectifier/regulator, and to the 30amp fuse in the starter solenoid.