see this .... the farthest left knob not in that pic is the light switch ... the 'button' on the floor is the headlight dimmer switch, if you get
a factory fuse panel it mounts above that in a cutout of the 'dash mat', it was only installed when a number of electrical options were ordered
if you keep the 6 cyl and don't add a bunch of modern electrical accessories, the stock arrangement can be pretty clean, no birds nests involved - I notice you don't have turn signals, you might want to try and find
an original unit to replace that plain cup below the steering wheel
Bill