Achipmunk,
Everyone tells me I'm simple, lets see if they're right. On the ammeter...if the needle wiggles then we will assume the meter is good. Connect a wire to each terminal of the ammeter and touch those wires to the posts of a battery...any polarity. The needle should jump for a second. This means it is probably OK.
On the fuel gauge. Hook a wire from the positive battery post to the terminal behind the 'E'. Touch another wire from the negative post to the case of the meter...it should show FULL! Leave everything the same but attach another wire from the unused gauge terminal to battery negative. The gauge should peg at EMPTY...that's it!
Stuart
