You can find the instrument lights (this will be those in the eyebrow, most of the planes did not have internally lighted instruments. This will be the lights controlled by the rheostat and from the second breaker from the left as shown in this picture:
As far as the left fuel tube reading high, You might have a restriction on the vent line (assuming level ground) and it might be time to repack both the upper and lower u-cups in the sight tubes, Contact Ken Blackman about the parts needed for your AA1A.
Cheers
Roscoe
Yankee-Aviation.com
513-519-7008