The circuit contains all the instrument lights for gauges etc. probably about 15 #1895 bulbs. Basically everything that is on a dimmer. I did find a picture of a fuse block that shows that as a 4 amp fuse.
Here is the problem, that slot looks like its made for a 1/4" x 5/8" fuse. I can find 3/4" and 7/8" but that's it. You could probably jam a 3/4' in there but, if successful, you would never get it out That fuse must be obsolete. I can find a 5mm x 20mm fuse that should work but I'm positive that is not the original fuse.
BUSSMANN Fuse: 5 A, 125V AC, 1kA at 125V AC, 5/8 in L x 1/4 in dia Fuse Size, 5 PK
These cartridge-style, fast-acting glass fuses open within seconds of being exposed to overloads and short circuits. They're commonly used in instrument panels, small appliance circuits, and automotive accessories. Also called fast-blow glass fuses, they are highly sensitive to changes in current flow and don't tolerate temporary overload currents or power surges.