autometer triple gauge wiring to fuse block question

If you look at the photo of the fuse block, note that there is two busses on the left side, and then a separate top fuse

The two busses are power coming in. One is always hot, and one is through the 'accessory' contacts of the ignition switch. The very top one is an oddball--it only feeds the instrument lamps.

All these old girls are terribly under-fused